diff --git a/litellm-proxy-extras/litellm_proxy_extras/migrations/20261106000000_add_access_group_vector_store_ids/migration.sql b/litellm-proxy-extras/litellm_proxy_extras/migrations/20261106000000_add_access_group_vector_store_ids/migration.sql
new file mode 100644
index 00000000000..fe06185e1f0
--- /dev/null
+++ b/litellm-proxy-extras/litellm_proxy_extras/migrations/20261106000000_add_access_group_vector_store_ids/migration.sql
@@ -0,0 +1,4 @@
+SET LOCAL lock_timeout = '10s';
+
+-- AlterTable
+ALTER TABLE "LiteLLM_AccessGroupTable" ADD COLUMN IF NOT EXISTS "access_vector_store_ids" TEXT[] DEFAULT ARRAY[]::TEXT[];
diff --git a/litellm-proxy-extras/litellm_proxy_extras/schema.prisma b/litellm-proxy-extras/litellm_proxy_extras/schema.prisma
index 818f2dc4858..b6e3df98550 100644
--- a/litellm-proxy-extras/litellm_proxy_extras/schema.prisma
+++ b/litellm-proxy-extras/litellm_proxy_extras/schema.prisma
@@ -1593,6 +1593,7 @@ model LiteLLM_AccessGroupTable {
   mcp_tool_permissions    Json?
   access_agent_ids        String[] @default([])
   access_skill_names      String[] @default([])
+  access_vector_store_ids String[] @default([])
 
   assigned_team_ids         String[] @default([])
   assigned_key_ids          String[] @default([])
diff --git a/litellm/models/access_group.py b/litellm/models/access_group.py
index fb0ab211bbc..cec0c1ef27e 100644
--- a/litellm/models/access_group.py
+++ b/litellm/models/access_group.py
@@ -20,6 +20,7 @@ class LiteLLM_AccessGroupTable(LiteLLMPydanticObjectBase):
     mcp_tool_permissions: Mapping[str, Sequence[str]] | None = None
     access_agent_ids: list[str] = []
     access_skill_names: tuple[str, ...] = ()
+    access_vector_store_ids: tuple[str, ...] = ()
     assigned_team_ids: list[str] = []
     assigned_key_ids: list[str] = []
     created_at: datetime | None = None
diff --git a/litellm/proxy/_lazy_openapi_snapshot.json b/litellm/proxy/_lazy_openapi_snapshot.json
index 0182c27fac4..d407c7b53b4 100644
--- a/litellm/proxy/_lazy_openapi_snapshot.json
+++ b/litellm/proxy/_lazy_openapi_snapshot.json
@@ -939,6 +939,20 @@
               ],
               "title": "Access Skill Names"
             },
+            "access_vector_store_ids": {
+              "anyOf": [
+                {
+                  "items": {
+                    "type": "string"
+                  },
+                  "type": "array"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "title": "Access Vector Store Ids"
+            },
             "assigned_key_ids": {
               "anyOf": [
                 {
@@ -1128,6 +1142,14 @@
               "title": "Access Skill Names",
               "type": "array"
             },
+            "access_vector_store_ids": {
+              "default": [],
+              "items": {
+                "type": "string"
+              },
+              "title": "Access Vector Store Ids",
+              "type": "array"
+            },
             "assigned_key_ids": {
               "items": {
                 "type": "string"
@@ -1304,6 +1326,20 @@
               ],
               "title": "Access Skill Names"
             },
+            "access_vector_store_ids": {
+              "anyOf": [
+                {
+                  "items": {
+                    "type": "string"
+                  },
+                  "type": "array"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "title": "Access Vector Store Ids"
+            },
             "assigned_key_ids": {
               "anyOf": [
                 {
diff --git a/litellm/proxy/auth/auth_checks.py b/litellm/proxy/auth/auth_checks.py
index b40eb451979..de573dcd6f5 100644
--- a/litellm/proxy/auth/auth_checks.py
+++ b/litellm/proxy/auth/auth_checks.py
@@ -5790,6 +5790,15 @@ async def can_team_access_model(
         raise
 
 
+def _group_lists_key_or_its_team(
+    group: LiteLLM_AccessGroupTable, valid_token: UserAPIKeyAuth, team_object: LiteLLM_TeamTable | None
+) -> bool:
+    key_team_id: Final = valid_token.team_id or (team_object.team_id if team_object is not None else None)
+    return bool(key_team_id and key_team_id in (group.assigned_team_ids or [])) or bool(
+        valid_token.token and valid_token.token in (group.assigned_key_ids or [])
+    )
+
+
 async def get_authorized_resources_from_key_access_groups(
     valid_token: UserAPIKeyAuth | None,
     team_object: LiteLLM_TeamTable | None,
@@ -5818,9 +5827,6 @@ async def get_authorized_resources_from_key_access_groups(
     if _prisma_client is None or _user_api_key_cache is None:
         return []
 
-    key_team_id: Final = valid_token.team_id or (team_object.team_id if team_object is not None else None)
-    key_token: Final = valid_token.token
-
     authorized_resources: Final[list[str]] = []
     for ag_id in key_access_group_ids:
         try:
@@ -5839,9 +5845,7 @@ async def get_authorized_resources_from_key_access_groups(
             if check_db_only or strict_errors:
                 raise
             continue
-        team_authorized = bool(key_team_id and key_team_id in (ag.assigned_team_ids or []))
-        key_authorized = bool(key_token and key_token in (ag.assigned_key_ids or []))
-        if team_authorized or key_authorized:
+        if _group_lists_key_or_its_team(ag, valid_token, team_object):
             authorized_resources.extend(getattr(ag, resource_field, []) or [])
 
     return list(set(authorized_resources))
@@ -8054,8 +8058,133 @@ def _legacy_requested_vector_store_ids(
     )
 
 
-def _restricts_vector_stores(grants: Sequence[tuple[GrantLayer, LiteLLM_ObjectPermissionTable | None]]) -> bool:
-    return any(grant is not None and bool(grant.vector_stores) for _, grant in grants)
+async def access_group_vector_stores(
+    valid_token: UserAPIKeyAuth | None, team_object: LiteLLM_TeamTable | None
+) -> Mapping[GrantLayer, tuple[str, ...]]:
+    """Stores the key's and its team's access groups grant, per layer.
+    A deleted group grants nothing, and an unreadable one raises."""
+    key_groups: Final = await get_access_group_tables(
+        (valid_token.access_group_ids or ()) if valid_token is not None else (), unreadable="raise"
+    )
+    team_groups: Final = await get_access_group_tables(
+        (team_object.access_group_ids or ()) if team_object is not None else (), unreadable="raise"
+    )
+    listed_key_groups: Final = (
+        tuple(group for group in key_groups if _group_lists_key_or_its_team(group, valid_token, team_object))
+        if valid_token is not None
+        else ()
+    )
+    return MappingProxyType(
+        {
+            "key": tuple(chain.from_iterable(group.access_vector_store_ids for group in listed_key_groups)),
+            "team": tuple(chain.from_iterable(group.access_vector_store_ids for group in team_groups)),
+        }
+    )
+
+
+@dataclass(frozen=True, slots=True)
+class _CombinedVectorStores:
+    vector_stores: Sequence[str]
+
+
+def _with_group_stores(
+    grant: LiteLLM_ObjectPermissionTable | None, group_stores: Sequence[str]
+) -> _CombinedVectorStores:
+    own_stores: Final = (grant.vector_stores or ()) if grant is not None else ()
+    return _CombinedVectorStores((*own_stores, *group_stores))
+
+
+async def _grants_with_group_stores(
+    group_stores: Mapping[GrantLayer, tuple[str, ...]],
+    valid_token: UserAPIKeyAuth | None,
+    team_object: LiteLLM_TeamTable | None,
+    user_object: LiteLLM_UserTable | None,
+    prisma_client: PrismaClient,
+    user_api_key_cache: UserApiKeyCache,
+) -> tuple[tuple[GrantLayer, _CombinedVectorStores], ...]:
+    return tuple(
+        (layer, _with_group_stores(grant, group_stores.get(layer, ())))
+        for layer, grant in await _identity_grants(
+            valid_token, team_object, user_object, prisma_client, user_api_key_cache
+        )
+    )
+
+
+async def _combined_vector_store_grants(
+    valid_token: UserAPIKeyAuth | None,
+    team_object: LiteLLM_TeamTable | None,
+    user_object: LiteLLM_UserTable | None,
+    prisma_client: PrismaClient,
+    user_api_key_cache: UserApiKeyCache,
+) -> tuple[tuple[GrantLayer, _CombinedVectorStores], ...]:
+    try:
+        group_stores: Final = await access_group_vector_stores(valid_token, team_object)
+    except Exception as e:
+        # Skipping an unreadable group could empty a list and lift the restriction.
+        raise ProxyException(
+            message="Could not read an access group to check vector store access",
+            type=ProxyErrorTypes.internal_server_error,
+            param="vector_store",
+            code=status.HTTP_503_SERVICE_UNAVAILABLE,
+        ) from e
+    return await _grants_with_group_stores(
+        group_stores, valid_token, team_object, user_object, prisma_client, user_api_key_cache
+    )
+
+
+def _require_every_layer_allows(
+    grants: Sequence[tuple[GrantLayer, _CombinedVectorStores]],
+    strict_layers: frozenset[GrantLayer],
+    vector_store_ids: Sequence[str],
+) -> None:
+    for layer, grant in grants:
+        if layer in strict_layers:
+            _require_vector_store_grant(layer, vector_store_ids, grant)
+        else:
+            _can_object_call_vector_stores(
+                object_type=layer,
+                vector_store_ids_to_run=vector_store_ids,
+                object_permissions=grant,
+            )
+
+
+def _every_layer_allows(
+    grants: Sequence[tuple[GrantLayer, _CombinedVectorStores]],
+    strict_layers: frozenset[GrantLayer],
+    vector_store_id: str,
+) -> bool:
+    try:
+        _require_every_layer_allows(grants, strict_layers, (vector_store_id,))
+    except ProxyException:
+        return False
+    return True
+
+
+async def vector_stores_opened_by_groups(
+    valid_token: UserAPIKeyAuth, team_object: LiteLLM_TeamTable | None
+) -> frozenset[str]:
+    """The stores the caller's groups list and the request check would allow. An unreadable group raises."""
+    from litellm.proxy.proxy_server import (
+        general_settings,  # pyright: ignore[reportUnknownVariableType]  # untyped module-level dict in proxy_server
+        prisma_client,
+        user_api_key_cache,
+    )
+
+    group_stores: Final = await access_group_vector_stores(valid_token, team_object)
+    listed: Final = tuple(chain.from_iterable(group_stores.values()))
+    if not listed or prisma_client is None:
+        return frozenset()
+    grants: Final = await _grants_with_group_stores(
+        group_stores, valid_token, team_object, None, prisma_client, user_api_key_cache
+    )
+    strict_layers: Final = _strict_grant_layers(
+        _vector_store_deny_by_default(_typed_request_body(general_settings)), valid_token, team_object
+    )
+    return frozenset(store for store in listed if _every_layer_allows(grants, strict_layers, store))
+
+
+def _restricts_vector_stores(grants: Sequence[tuple[GrantLayer, _CombinedVectorStores]]) -> bool:
+    return any(bool(grant.vector_stores) for _, grant in grants)
 
 
 def _request_drop_policies(
@@ -8114,13 +8243,13 @@ async def vector_store_access_check(
     user_object: LiteLLM_UserTable | None = None,
     deny_by_default: bool = False,
     llm_router: Router | None = None,
-):
+) -> Literal[True]:
     """
     Checks whether the caller may use every vector store the request names.
 
     Requested stores come from `vector_store_ids`, `tools[].vector_store_ids`, the tools of
     `additional_tools` input items and the RAG `retrieval_config.vector_store_id`. Grants come from each identity's
-    `object_permission.vector_stores`.
+    `object_permission.vector_stores` plus the stores its access groups grant.
 
     Both modes read the same request fields, with or without a vector store registry, and answer 400
     when the top-level `vector_store_ids` is not a list of strings, which legacy mode does only when the
@@ -8168,7 +8297,7 @@ async def vector_store_access_check(
     )
     if isinstance(requested_ids, _UnreadableVectorStoreIds):
         if _restricts_vector_stores(
-            await _identity_grants(valid_token, team_object, None, prisma_client, user_api_key_cache)
+            await _combined_vector_store_grants(valid_token, team_object, None, prisma_client, user_api_key_cache)
         ):
             raise _malformed_vector_store_ids()
         return True
@@ -8182,26 +8311,18 @@ async def vector_store_access_check(
     # Check if the object (key, team, org) has access to the vector store
     #########################################################
     strict_layers: Final = _strict_grant_layers(deny_by_default, valid_token, team_object)
-    grants: Final = await _identity_grants(
+    grants: Final = await _combined_vector_store_grants(
         valid_token,
         team_object,
         user_object if "user" in strict_layers else None,
         prisma_client,
         user_api_key_cache,
     )
-    for layer, grant in grants:
-        if layer in strict_layers:
-            _require_vector_store_grant(layer, vector_store_ids_to_run, grant)
-        elif grant is not None:
-            _can_object_call_vector_stores(
-                object_type=layer,
-                vector_store_ids_to_run=vector_store_ids_to_run,
-                object_permissions=grant,
-            )
+    _require_every_layer_allows(grants, strict_layers, vector_store_ids_to_run)
     return True
 
 
-def _provider_vector_store_id(vector_store_id: str) -> str:
+def provider_vector_store_id(vector_store_id: str) -> str:
     if not is_base64_encoded_unified_id(vector_store_id):
         return vector_store_id
     return extract_provider_resource_id_from_unified_id(vector_store_id) or vector_store_id
@@ -8211,7 +8332,7 @@ def _can_object_call_vector_stores(
     object_type: Literal["key", "team", "org", "user"],
     vector_store_ids_to_run: Sequence[str],
     object_permissions: _VectorStorePermissionsRow | None,
-):
+) -> Literal[True]:
     """
     Raises ProxyException if the object (key, team, org) cannot access the specific vector store.
     """
@@ -8225,9 +8346,9 @@ def _can_object_call_vector_stores(
     if len(object_permissions.vector_stores) == 0:
         return True
 
-    allowed_stores: Final = frozenset(map(_provider_vector_store_id, object_permissions.vector_stores))
+    allowed_stores: Final = frozenset(map(provider_vector_store_id, object_permissions.vector_stores))
     for vector_store_id in vector_store_ids_to_run:
-        if _provider_vector_store_id(vector_store_id) not in allowed_stores:
+        if provider_vector_store_id(vector_store_id) not in allowed_stores:
             raise ProxyException(
                 message=f"User not allowed to access vector store. Tried to access {vector_store_id}. Only allowed to access {object_permissions.vector_stores}",
                 type=ProxyErrorTypes.get_vector_store_access_error_type_for_object(object_type),
diff --git a/litellm/proxy/common_request_processing.py b/litellm/proxy/common_request_processing.py
index 4d7c67972f2..6f6fdd90aec 100644
--- a/litellm/proxy/common_request_processing.py
+++ b/litellm/proxy/common_request_processing.py
@@ -871,11 +871,11 @@ async def _authorize_response_file_search_vector_stores(
         return
 
     from litellm.proxy.vector_store_endpoints.utils import (
-        assert_user_can_access_vector_store_id,
+        assert_user_can_read_vector_store_id,
     )
 
     for vector_store_id in sorted(vector_store_ids):
-        await assert_user_can_access_vector_store_id(
+        await assert_user_can_read_vector_store_id(
             vector_store_id=vector_store_id,
             user_api_key_dict=user_api_key_dict,
         )
diff --git a/litellm/proxy/management_endpoints/access_group_endpoints.py b/litellm/proxy/management_endpoints/access_group_endpoints.py
index 4cbc2155af0..6c6df8dd6b9 100644
--- a/litellm/proxy/management_endpoints/access_group_endpoints.py
+++ b/litellm/proxy/management_endpoints/access_group_endpoints.py
@@ -572,6 +572,7 @@ async def create_access_group(
                     "mcp_tool_permissions": _tool_permissions_json(data.mcp_tool_permissions),
                     "access_agent_ids": data.access_agent_ids or [],
                     "access_skill_names": list(data.access_skill_names or ()),
+                    "access_vector_store_ids": list(data.access_vector_store_ids or ()),
                     "assigned_team_ids": data.assigned_team_ids or [],
                     "assigned_key_ids": data.assigned_key_ids or [],
                     "created_by": user_api_key_dict.user_id,
@@ -670,6 +671,7 @@ async def update_access_group(
             "access_mcp_server_ids",
             "access_agent_ids",
             "access_skill_names",
+            "access_vector_store_ids",
         ):
             value = list(iter_items(value or ()))
         update_data[field] = (
diff --git a/litellm/proxy/rag_endpoints/endpoints.py b/litellm/proxy/rag_endpoints/endpoints.py
index 2d81dc32181..dc11922f48d 100644
--- a/litellm/proxy/rag_endpoints/endpoints.py
+++ b/litellm/proxy/rag_endpoints/endpoints.py
@@ -8,7 +8,7 @@ Provides:
 
 import base64
 import json
-from collections.abc import Mapping
+from collections.abc import Awaitable, Callable, Mapping
 from types import MappingProxyType
 from typing import TYPE_CHECKING, Any, Final
 
@@ -58,6 +58,7 @@ from litellm.proxy.vector_store_endpoints.endpoints import (
 )
 from litellm.proxy.vector_store_endpoints.utils import (
     assert_user_can_access_vector_store_id,
+    assert_user_can_read_vector_store_id,
 )
 from litellm.rag.main import get_ingestion_class
 from litellm.repositories.table_repositories import ManagedVectorStoresRepository
@@ -151,19 +152,14 @@ def _collect_vector_store_ids_from_payload(payload: object) -> set[str]:
 async def _authorize_nested_vector_store_ids(
     payload: object,
     user_api_key_dict: UserAPIKeyAuth,
+    authorize: Callable[[str, UserAPIKeyAuth], Awaitable[LiteLLM_ManagedVectorStore | None]],
 ) -> Mapping[str, LiteLLM_ManagedVectorStore]:
     """Authorize every nested vector store id and return the managed stores it resolved."""
     return MappingProxyType(
         {
             vector_store_id: store
             for vector_store_id in sorted(_collect_vector_store_ids_from_payload(payload))
-            if (
-                store := await assert_user_can_access_vector_store_id(
-                    vector_store_id=vector_store_id,
-                    user_api_key_dict=user_api_key_dict,
-                )
-            )
-            is not None
+            if (store := await authorize(vector_store_id, user_api_key_dict)) is not None
         }
     )
 
@@ -675,6 +671,7 @@ async def rag_ingest(
         resolved_stores: Final = await _authorize_nested_vector_store_ids(
             payload=ingest_options,
             user_api_key_dict=user_api_key_dict,
+            authorize=assert_user_can_access_vector_store_id,
         )
 
         request_vector_store_config: Final = ingest_options.get("vector_store", {})
@@ -897,6 +894,7 @@ async def rag_query(
         resolved_stores: Final = await _authorize_nested_vector_store_ids(
             payload=retrieval_config,
             user_api_key_dict=user_api_key_dict,
+            authorize=assert_user_can_read_vector_store_id,
         )
 
         # Merge litellm-managed vector store params (provider, region, embedding
diff --git a/litellm/proxy/schema.prisma b/litellm/proxy/schema.prisma
index 818f2dc4858..b6e3df98550 100644
--- a/litellm/proxy/schema.prisma
+++ b/litellm/proxy/schema.prisma
@@ -1593,6 +1593,7 @@ model LiteLLM_AccessGroupTable {
   mcp_tool_permissions    Json?
   access_agent_ids        String[] @default([])
   access_skill_names      String[] @default([])
+  access_vector_store_ids String[] @default([])
 
   assigned_team_ids         String[] @default([])
   assigned_key_ids          String[] @default([])
diff --git a/litellm/proxy/vector_store_endpoints/endpoints.py b/litellm/proxy/vector_store_endpoints/endpoints.py
index c0d7ab8d6e1..a0d97531afd 100644
--- a/litellm/proxy/vector_store_endpoints/endpoints.py
+++ b/litellm/proxy/vector_store_endpoints/endpoints.py
@@ -1,4 +1,4 @@
-from collections.abc import Mapping, Sequence
+from collections.abc import Awaitable, Callable, Mapping, Sequence
 from types import MappingProxyType
 from typing import (
     TYPE_CHECKING,
@@ -25,6 +25,7 @@ from litellm.proxy.utils import jsonify_object
 from litellm.proxy.vector_store_endpoints.utils import (
     assert_proxy_admin_for_vector_store_index_management,
     assert_user_can_access_vector_store,
+    assert_user_can_read_vector_store,
     get_litellm_managed_vector_store,
 )
 from litellm.repositories.table_repositories import ManagedVectorStoreIndexRepository
@@ -115,6 +116,8 @@ async def _update_request_data_with_litellm_managed_vector_store_registry(
     data: dict,
     vector_store_id: str,
     user_api_key_dict: UserAPIKeyAuth | None = None,
+    *,
+    authorize: Callable[[LiteLLM_ManagedVectorStore, UserAPIKeyAuth], Awaitable[None]],
 ) -> dict:
     """
     Update the request data with the litellm managed vector store registry.
@@ -123,6 +126,7 @@ async def _update_request_data_with_litellm_managed_vector_store_registry(
         data: Request data to update
         vector_store_id: ID of the vector store
         user_api_key_dict: User API key authentication info for access control
+        authorize: Refuses a caller who may not run this request on the vector store
 
     Raises:
         HTTPException: If user doesn't have access to the vector store
@@ -133,10 +137,7 @@ async def _update_request_data_with_litellm_managed_vector_store_registry(
     if vector_store_to_run is None:
         return data
     if user_api_key_dict is not None:
-        await assert_user_can_access_vector_store(
-            vector_store=vector_store_to_run,
-            user_api_key_dict=user_api_key_dict,
-        )
+        await authorize(vector_store_to_run, user_api_key_dict)
     return {**data, **build_request_data_from_managed_vector_store(vector_store_to_run)}
 
 
@@ -182,7 +183,10 @@ async def vector_store_search(
 
     # Check for legacy vector store registry (non-managed vector stores)
     data = await _update_request_data_with_litellm_managed_vector_store_registry(
-        data=data, vector_store_id=vector_store_id, user_api_key_dict=user_api_key_dict
+        data=data,
+        vector_store_id=vector_store_id,
+        user_api_key_dict=user_api_key_dict,
+        authorize=assert_user_can_read_vector_store,
     )
     reject_caller_opensearch_index_name(
         caller_body=caller_body,
@@ -369,7 +373,10 @@ async def vector_store_retrieve(
     data = {"vector_store_id": vector_store_id}
 
     data = await _update_request_data_with_litellm_managed_vector_store_registry(
-        data=data, vector_store_id=vector_store_id, user_api_key_dict=user_api_key_dict
+        data=data,
+        vector_store_id=vector_store_id,
+        user_api_key_dict=user_api_key_dict,
+        authorize=assert_user_can_read_vector_store,
     )
 
     processor: Final = ProxyBaseLLMRequestProcessing(data=data)
@@ -508,7 +515,10 @@ async def vector_store_update(
     )
 
     data = await _update_request_data_with_litellm_managed_vector_store_registry(
-        data=data, vector_store_id=vector_store_id, user_api_key_dict=user_api_key_dict
+        data=data,
+        vector_store_id=vector_store_id,
+        user_api_key_dict=user_api_key_dict,
+        authorize=assert_user_can_access_vector_store,
     )
 
     processor: Final = ProxyBaseLLMRequestProcessing(data=data)
@@ -571,7 +581,10 @@ async def vector_store_delete(
     data = {"vector_store_id": vector_store_id}
 
     data = await _update_request_data_with_litellm_managed_vector_store_registry(
-        data=data, vector_store_id=vector_store_id, user_api_key_dict=user_api_key_dict
+        data=data,
+        vector_store_id=vector_store_id,
+        user_api_key_dict=user_api_key_dict,
+        authorize=assert_user_can_access_vector_store,
     )
 
     processor: Final = ProxyBaseLLMRequestProcessing(data=data)
diff --git a/litellm/proxy/vector_store_endpoints/management_endpoints.py b/litellm/proxy/vector_store_endpoints/management_endpoints.py
index 4b9547300db..011403f8c33 100644
--- a/litellm/proxy/vector_store_endpoints/management_endpoints.py
+++ b/litellm/proxy/vector_store_endpoints/management_endpoints.py
@@ -10,6 +10,7 @@ All /vector_store management endpoints
 
 import copy
 import json
+from collections.abc import Awaitable, Callable
 from typing import TYPE_CHECKING, Any, Final
 
 from fastapi import APIRouter, Depends, HTTPException
@@ -34,6 +35,7 @@ from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
 from litellm.proxy.common_utils.rbac_utils import check_feature_access_for_user
 from litellm.proxy.vector_store_endpoints.utils import (
     can_user_access_vector_store,
+    can_user_read_vector_store,
     filter_listable_vector_stores,
 )
 from litellm.repositories.prisma_protocols import TableActions
@@ -139,6 +141,7 @@ async def _fetch_and_authorize_vector_store(
     vector_store_id: str,
     user_api_key_dict: UserAPIKeyAuth,
     prisma_client: "PrismaClient",
+    is_authorized: Callable[[LiteLLM_ManagedVectorStore, UserAPIKeyAuth], Awaitable[bool]],
 ) -> "LiteLLM_ManagedVectorStore":
     """
     Look up a vector store by id and confirm the caller can access it.
@@ -152,7 +155,7 @@ async def _fetch_and_authorize_vector_store(
             detail=f"Vector store with ID {vector_store_id} not found",
         )
     typed: Final = _row_to_vector_store(row)
-    if not await _check_vector_store_access(typed, user_api_key_dict):
+    if not await is_authorized(typed, user_api_key_dict):
         raise HTTPException(
             status_code=403,
             detail="Access denied: You do not have permission to access this vector store",
@@ -559,7 +562,7 @@ async def get_vector_store_info(
             )
             if vector_store is not None:
                 # Check access control
-                if not await _check_vector_store_access(vector_store, user_api_key_dict):
+                if not await can_user_read_vector_store(vector_store, user_api_key_dict):
                     raise HTTPException(
                         status_code=403,
                         detail="Access denied: You do not have permission to access this vector store",
@@ -593,6 +596,7 @@ async def get_vector_store_info(
             vector_store_id=data.vector_store_id,
             user_api_key_dict=user_api_key_dict,
             prisma_client=prisma_client,
+            is_authorized=can_user_read_vector_store,
         )
         vector_store_dict: Final = dict(vector_store_typed)
         if "litellm_params" in vector_store_dict:
@@ -641,6 +645,7 @@ async def update_vector_store(
             vector_store_id=vector_store_id,
             user_api_key_dict=user_api_key_dict,
             prisma_client=prisma_client,
+            is_authorized=_check_vector_store_access,
         )
 
         # Handle metadata serialization
diff --git a/litellm/proxy/vector_store_endpoints/utils.py b/litellm/proxy/vector_store_endpoints/utils.py
index 8ce48fc3516..a21f57dfeaf 100644
--- a/litellm/proxy/vector_store_endpoints/utils.py
+++ b/litellm/proxy/vector_store_endpoints/utils.py
@@ -247,16 +247,72 @@ async def _is_vector_store_granted_to_any(
     return False
 
 
+async def _group_store_ids_for_context(user_api_key_dict: UserAPIKeyAuth) -> frozenset[str]:
+    """Reads only add access here, so a group or team that cannot be read grants nothing."""
+    from litellm.proxy.auth.auth_checks import get_team_object, vector_stores_opened_by_groups
+    from litellm.proxy.proxy_server import prisma_client, proxy_logging_obj, user_api_key_cache
+
+    team_id: Final = user_api_key_dict.team_id
+    try:
+        team: Final = (
+            await get_team_object(
+                team_id=team_id,
+                prisma_client=prisma_client,
+                user_api_key_cache=user_api_key_cache,
+                parent_otel_span=user_api_key_dict.parent_otel_span,
+                proxy_logging_obj=proxy_logging_obj,
+            )
+            if team_id is not None
+            else None
+        )
+        return await vector_stores_opened_by_groups(user_api_key_dict, team)
+    except Exception as e:  # noqa: BLE001  # grants nothing, per the docstring
+        verbose_proxy_logger.debug("Could not read access groups for vector store access: %s", e)
+        return frozenset()
+
+
+async def _group_granted_vector_store_ids(auth_contexts: tuple[UserAPIKeyAuth, ...]) -> frozenset[str]:
+    return frozenset[str]().union(*[await _group_store_ids_for_context(context) for context in auth_contexts])
+
+
+def _is_group_granted(vector_store: LiteLLM_ManagedVectorStore, group_store_ids: frozenset[str]) -> bool:
+    """Two managed ids can share a provider id, so only a store known by its provider id matches by one."""
+    from litellm.proxy.auth.auth_checks import provider_vector_store_id
+
+    store_id: Final = vector_store.get("vector_store_id") or ""
+    if store_id in group_store_ids:
+        return True
+    return provider_vector_store_id(store_id) == store_id and store_id in map(provider_vector_store_id, group_store_ids)
+
+
+async def can_user_read_vector_store(
+    vector_store: LiteLLM_ManagedVectorStore,
+    user_api_key_dict: UserAPIKeyAuth,
+) -> bool:
+    """Using or reading a store also counts access groups. Managing one does not."""
+    if await can_user_access_vector_store(vector_store, user_api_key_dict):
+        return True
+    auth_contexts: Final = await _vector_store_auth_contexts(user_api_key_dict)
+    return _is_group_granted(vector_store, await _group_granted_vector_store_ids(auth_contexts))
+
+
 async def filter_listable_vector_stores(
     vector_stores: Iterable[LiteLLM_ManagedVectorStore],
     user_api_key_dict: UserAPIKeyAuth,
 ) -> tuple[LiteLLM_ManagedVectorStore, ...]:
-    """Non-admins only see stores their key, one of their teams' object_permission, or team ownership grants."""
+    """Non-admins only see stores their key, a team's object_permission, team ownership or access groups grant."""
     if _is_proxy_admin(user_api_key_dict):
         return tuple(vector_stores)
 
     auth_contexts: Final = await _vector_store_auth_contexts(user_api_key_dict)
-    return tuple([vs for vs in vector_stores if await _is_vector_store_granted_to_any(vs, auth_contexts)])
+    group_store_ids: Final = await _group_granted_vector_store_ids(auth_contexts)
+    return tuple(
+        [
+            vs
+            for vs in vector_stores
+            if _is_group_granted(vs, group_store_ids) or await _is_vector_store_granted_to_any(vs, auth_contexts)
+        ]
+    )
 
 
 async def get_litellm_managed_vector_store(
@@ -353,6 +409,26 @@ async def assert_user_can_access_vector_store_id(
     return vector_store
 
 
+async def assert_user_can_read_vector_store(
+    vector_store: LiteLLM_ManagedVectorStore,
+    user_api_key_dict: UserAPIKeyAuth,
+) -> None:
+    if not await can_user_read_vector_store(vector_store, user_api_key_dict):
+        raise HTTPException(
+            status_code=403, detail="Access denied: You do not have permission to access this vector store"
+        )
+
+
+async def assert_user_can_read_vector_store_id(
+    vector_store_id: str,
+    user_api_key_dict: UserAPIKeyAuth,
+) -> LiteLLM_ManagedVectorStore | None:
+    vector_store: Final = await get_litellm_managed_vector_store(vector_store_id=vector_store_id)
+    if vector_store is not None:
+        await assert_user_can_read_vector_store(vector_store, user_api_key_dict)
+    return vector_store
+
+
 def _does_endpoint_match(endpoint_path: str, request_path: str) -> bool:
     if endpoint_path in request_path:
         return True
diff --git a/litellm/proxy/vector_store_files_endpoints/endpoints.py b/litellm/proxy/vector_store_files_endpoints/endpoints.py
index dbe08dbd98e..ecea76c8103 100644
--- a/litellm/proxy/vector_store_files_endpoints/endpoints.py
+++ b/litellm/proxy/vector_store_files_endpoints/endpoints.py
@@ -26,6 +26,7 @@ from litellm.proxy.openai_files_endpoints.common_utils import (
 from litellm.proxy.rag_endpoints.upload_security import safe_download_headers
 from litellm.proxy.vector_store_endpoints.utils import (
     assert_user_can_access_vector_store_id,
+    assert_user_can_read_vector_store_id,
     is_allowed_to_call_vector_store_files_endpoint,
 )
 from litellm.types.utils import LlmProviders
@@ -686,7 +687,7 @@ async def vector_store_file_list(
     data: dict[str, str | None] = {"vector_store_id": vector_store_id}
     data.update(query_params)
     data["vector_store_id"] = vector_store_id
-    managed_vector_store: Final = await assert_user_can_access_vector_store_id(
+    managed_vector_store: Final = await assert_user_can_read_vector_store_id(
         vector_store_id=vector_store_id,
         user_api_key_dict=user_api_key_dict,
     )
@@ -794,7 +795,7 @@ async def vector_store_file_retrieve(
         "vector_store_id": vector_store_id,
         "file_id": file_id,
     }
-    managed_vector_store: Final = await assert_user_can_access_vector_store_id(
+    managed_vector_store: Final = await assert_user_can_read_vector_store_id(
         vector_store_id=vector_store_id,
         user_api_key_dict=user_api_key_dict,
     )
@@ -901,7 +902,7 @@ async def vector_store_file_content(
         "vector_store_id": vector_store_id,
         "file_id": file_id,
     }
-    managed_vector_store: Final = await assert_user_can_access_vector_store_id(
+    managed_vector_store: Final = await assert_user_can_read_vector_store_id(
         vector_store_id=vector_store_id,
         user_api_key_dict=user_api_key_dict,
     )
diff --git a/litellm/types/access_group.py b/litellm/types/access_group.py
index 2fa8cb8e592..d4ad7afc54a 100644
--- a/litellm/types/access_group.py
+++ b/litellm/types/access_group.py
@@ -12,6 +12,7 @@ class AccessGroupCreateRequest(LiteLLMBaseModel):
     mcp_tool_permissions: Mapping[str, Sequence[str]] | None = None
     access_agent_ids: list[str] | None = None
     access_skill_names: tuple[str, ...] | None = None
+    access_vector_store_ids: tuple[str, ...] | None = None
     assigned_team_ids: list[str] | None = None
     assigned_key_ids: list[str] | None = None
 
@@ -24,6 +25,7 @@ class AccessGroupUpdateRequest(LiteLLMBaseModel):
     mcp_tool_permissions: Mapping[str, Sequence[str]] | None = None
     access_agent_ids: list[str] | None = None
     access_skill_names: tuple[str, ...] | None = None
+    access_vector_store_ids: tuple[str, ...] | None = None
     assigned_team_ids: list[str] | None = None
     assigned_key_ids: list[str] | None = None
 
@@ -44,6 +46,7 @@ class AccessGroupResponse(LiteLLMBaseModel):
     mcp_tool_permissions: Mapping[str, Sequence[str]] | None = None
     access_agent_ids: list[str]
     access_skill_names: tuple[str, ...] = ()
+    access_vector_store_ids: tuple[str, ...] = ()
     assigned_team_ids: list[str]
     assigned_key_ids: list[str]
     access_mcp_servers: tuple[AccessGroupResource, ...]
diff --git a/schema.prisma b/schema.prisma
index 818f2dc4858..b6e3df98550 100644
--- a/schema.prisma
+++ b/schema.prisma
@@ -1593,6 +1593,7 @@ model LiteLLM_AccessGroupTable {
   mcp_tool_permissions    Json?
   access_agent_ids        String[] @default([])
   access_skill_names      String[] @default([])
+  access_vector_store_ids String[] @default([])
 
   assigned_team_ids         String[] @default([])
   assigned_key_ids          String[] @default([])
diff --git a/tests/unit/proxy/auth/test_vector_store_access_groups.py b/tests/unit/proxy/auth/test_vector_store_access_groups.py
new file mode 100644
index 00000000000..f6ed2b1bdd1
--- /dev/null
+++ b/tests/unit/proxy/auth/test_vector_store_access_groups.py
@@ -0,0 +1,239 @@
+"""A team or key in an access group that grants stores can use those stores and no others."""
+
+import base64
+from collections.abc import Sequence
+from typing import Final
+from unittest.mock import AsyncMock
+
+import pytest
+
+from litellm import Router
+from litellm.proxy._types import LiteLLM_TeamTableCachedObj, ProxyException, UserAPIKeyAuth
+from litellm.proxy.auth.auth_checks import vector_store_access_check
+from tests.unit.proxy.vector_store_access_group_state import (
+    TEAM_ID,
+    TOKEN,
+    ProxyState,
+    make_key,
+    make_team,
+)
+
+
+@pytest.fixture
+def proxy(monkeypatch: pytest.MonkeyPatch) -> ProxyState:
+    return ProxyState(monkeypatch)
+
+
+def _virtual_key(groups: Sequence[str]) -> UserAPIKeyAuth:
+    key: Final = UserAPIKeyAuth(token=TOKEN, api_key=TOKEN, team_id=TEAM_ID, access_group_ids=list(groups))
+    key.via_virtual_key = True
+    return key
+
+
+async def _request_is_allowed(
+    key: UserAPIKeyAuth, team: LiteLLM_TeamTableCachedObj | None, store: str, *, deny_by_default: bool = False
+) -> bool:
+    try:
+        await vector_store_access_check(
+            request_body={"vector_store_ids": [store]},
+            team_object=team,
+            valid_token=key,
+            deny_by_default=deny_by_default,
+        )
+    except ProxyException as refused:
+        if refused.code != "401":
+            raise
+        return False
+    return True
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    ("key_stores", "key_groups", "team_stores", "team_groups", "store", "allowed"),
+    [
+        pytest.param(None, ("g1",), None, (), "store-a", True, id="key-group-grants"),
+        pytest.param(None, ("g1",), None, (), "store-b", False, id="key-group-restricts"),
+        pytest.param((), ("g1",), None, (), "store-b", False, id="key-group-restricts-with-empty-own-list"),
+        pytest.param(None, (), None, ("g1",), "store-a", True, id="team-group-grants"),
+        pytest.param(None, (), None, ("g1",), "store-b", False, id="team-group-restricts"),
+        pytest.param(None, (), (), ("g1",), "store-b", False, id="team-group-restricts-with-empty-own-list"),
+        pytest.param(("store-x",), ("g1",), None, (), "store-a", True, id="key-group-widens-own-list"),
+        pytest.param(("store-x",), ("g1",), None, (), "store-x", True, id="key-own-list-still-counts"),
+        pytest.param(("store-x",), ("g1",), None, (), "store-b", False, id="key-neither-list-denies"),
+        pytest.param(None, (), ("store-x",), ("g1",), "store-a", True, id="team-group-widens-own-list"),
+        pytest.param(None, (), ("store-x",), ("g1",), "store-x", True, id="team-own-list-still-counts"),
+        pytest.param(("store-x",), (), None, ("g1",), "store-a", False, id="key-own-list-narrows-team-group"),
+        pytest.param(None, ("g1",), ("store-x",), (), "store-a", False, id="team-own-list-narrows-key-group"),
+        pytest.param(None, ("g1", "g2"), None, (), "store-c", True, id="stores-from-a-second-group"),
+        pytest.param(None, ("models-only",), None, (), "store-b", True, id="models-only-group-changes-nothing"),
+        pytest.param(None, (), None, ("models-only",), "store-b", True, id="team-models-only-group-changes-nothing"),
+        pytest.param(("store-x",), ("models-only",), None, (), "store-b", False, id="models-only-keeps-own-list"),
+        pytest.param(None, (), None, (), "store-b", True, id="no-grants-anywhere-changes-nothing"),
+    ],
+)
+async def test_request_check_combines_own_list_and_group_stores(
+    proxy: ProxyState,
+    key_stores: Sequence[str] | None,
+    key_groups: Sequence[str],
+    team_stores: Sequence[str] | None,
+    team_groups: Sequence[str],
+    store: str,
+    allowed: bool,
+) -> None:
+    await proxy.add_group("g1", ("store-a",))
+    await proxy.add_group("g2", ("store-c",))
+    await proxy.add_group("models-only", models=("gpt-4",))
+
+    assert (
+        await _request_is_allowed(make_key(key_stores, key_groups, TEAM_ID), make_team(team_stores, team_groups), store)
+        is allowed
+    )
+
+
+@pytest.mark.asyncio
+async def test_key_group_counts_when_it_lists_only_the_keys_team(proxy: ProxyState) -> None:
+    await proxy.add_group("g1", ("store-a",), key_ids=())
+
+    assert await _request_is_allowed(make_key(groups=("g1",), team_id=TEAM_ID), None, "store-a") is True
+    assert await _request_is_allowed(make_key(groups=("g1",), team_id=TEAM_ID), None, "store-b") is False
+
+
+@pytest.mark.asyncio
+async def test_key_cannot_claim_a_group_that_does_not_list_it(proxy: ProxyState) -> None:
+    await proxy.add_group("g1", ("store-a",), team_ids=(), key_ids=())
+
+    assert await _request_is_allowed(make_key(("store-x",), ("g1",)), None, "store-a") is False
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    ("store", "allowed"),
+    [pytest.param("store-a", True, id="granted"), pytest.param("store-b", False, id="not-granted")],
+)
+async def test_deny_by_default_counts_group_grants(proxy: ProxyState, store: str, allowed: bool) -> None:
+    await proxy.add_group("g1", ("store-a",))
+    key: Final = _virtual_key(("g1",))
+
+    assert await _request_is_allowed(key, make_team(groups=("g1",)), store, deny_by_default=True) is allowed
+
+
+@pytest.mark.asyncio
+async def test_deny_by_default_requires_the_key_too_not_only_its_team(proxy: ProxyState) -> None:
+    await proxy.add_group("g1", ("store-a",))
+    key: Final = _virtual_key(())
+
+    assert await _request_is_allowed(key, make_team(groups=("g1",)), "store-a", deny_by_default=True) is False
+
+
+@pytest.mark.asyncio
+async def test_managed_store_id_in_a_group_matches_its_provider_id(proxy: ProxyState) -> None:
+    managed_id: Final = base64.urlsafe_b64encode(
+        b"litellm_proxy:vector_store;unified_id,abc;target_model_names,gpt-4;resource_id,vs_provider"
+    ).decode()
+    await proxy.add_group("g1", (managed_id,))
+
+    assert await _request_is_allowed(make_key(groups=("g1",)), None, "vs_provider") is True
+
+
+@pytest.mark.asyncio
+async def test_keyless_team_member_gets_the_teams_group_stores(proxy: ProxyState) -> None:
+    await proxy.add_group("g1", ("store-a",))
+    member: Final = UserAPIKeyAuth(team_id=TEAM_ID)
+
+    assert await _request_is_allowed(member, make_team(groups=("g1",)), "store-a") is True
+    assert await _request_is_allowed(member, make_team(groups=("g1",)), "store-b") is False
+
+
+@pytest.mark.asyncio
+async def test_deny_by_default_still_denies_a_models_only_group(proxy: ProxyState) -> None:
+    await proxy.add_group("models-only", models=("gpt-4",))
+    key: Final = _virtual_key(("models-only",))
+
+    assert await _request_is_allowed(key, make_team(groups=("models-only",)), "store-a", deny_by_default=True) is False
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    ("key_groups", "team_groups"),
+    [pytest.param(("g1",), (), id="key-group"), pytest.param((), ("g1",), id="team-group")],
+)
+async def test_unreadable_group_blocks_the_request_instead_of_lifting_the_restriction(
+    monkeypatch: pytest.MonkeyPatch, key_groups: Sequence[str], team_groups: Sequence[str]
+) -> None:
+    ProxyState(monkeypatch, group_reads=AsyncMock(side_effect=RuntimeError("database unavailable")))
+
+    with pytest.raises(ProxyException) as denied:
+        await vector_store_access_check(
+            request_body={"vector_store_ids": ["store-b"]},
+            team_object=make_team(groups=team_groups),
+            valid_token=make_key(groups=key_groups, team_id=TEAM_ID),
+        )
+
+    assert denied.value.code == "503"
+    assert denied.value.message == "Could not read an access group to check vector store access"
+
+
+@pytest.mark.asyncio
+async def test_deleted_group_grants_nothing_and_does_not_fail_the_request(proxy: ProxyState) -> None:
+    assert await _request_is_allowed(make_key(team_id=TEAM_ID), make_team(groups=("deleted",)), "store-b") is True
+    assert (
+        await _request_is_allowed(make_key(("store-x",), team_id=TEAM_ID), make_team(groups=("deleted",)), "store-b")
+        is False
+    )
+
+
+@pytest.mark.asyncio
+async def test_group_cached_before_the_upgrade_keeps_the_callers_own_list(proxy: ProxyState) -> None:
+    await proxy.cache.async_set_cache(
+        key="access_group_id:old",
+        value={"access_group_id": "old", "access_group_name": "old", "assigned_team_ids": [TEAM_ID]},
+    )
+
+    assert (
+        await _request_is_allowed(make_key(("store-x",), team_id=TEAM_ID), make_team(groups=("old",)), "store-b")
+        is False
+    )
+    assert (
+        await _request_is_allowed(make_key(("store-x",), team_id=TEAM_ID), make_team(groups=("old",)), "store-x")
+        is True
+    )
+
+
+@pytest.mark.asyncio
+async def test_malformed_store_ids_are_rejected_when_only_a_group_restricts(proxy: ProxyState) -> None:
+    await proxy.add_group("g1", ("store-a",))
+
+    with pytest.raises(ProxyException, match="vector_store_ids must be a list of strings"):
+        await vector_store_access_check(
+            request_body={"model": "gpt-4o-mini", "vector_store_ids": 123},
+            team_object=make_team(groups=("g1",)),
+            valid_token=make_key(team_id=TEAM_ID),
+            llm_router=Router(model_list=[{"model_name": "gpt-4o-mini", "litellm_params": {"model": "gpt-4o-mini"}}]),
+        )
+
+
+@pytest.mark.asyncio
+async def test_malformed_store_ids_with_an_unreadable_group_block_the_request(monkeypatch: pytest.MonkeyPatch) -> None:
+    ProxyState(monkeypatch, group_reads=AsyncMock(side_effect=RuntimeError("database unavailable")))
+
+    with pytest.raises(ProxyException) as denied:
+        await vector_store_access_check(
+            request_body={"model": "gpt-4o-mini", "vector_store_ids": "store-b"},
+            team_object=make_team(groups=("g1",)),
+            valid_token=make_key(team_id=TEAM_ID),
+            llm_router=Router(model_list=[{"model_name": "gpt-4o-mini", "litellm_params": {"model": "gpt-4o-mini"}}]),
+        )
+
+    assert denied.value.code == "503"
+
+
+@pytest.mark.asyncio
+async def test_request_naming_no_store_never_reads_groups(monkeypatch: pytest.MonkeyPatch) -> None:
+    proxy: Final = ProxyState(monkeypatch, group_reads=AsyncMock(side_effect=RuntimeError("database unavailable")))
+
+    result: Final = await vector_store_access_check(
+        request_body={"model": "gpt-4"}, team_object=make_team(groups=("g1",)), valid_token=make_key(team_id=TEAM_ID)
+    )
+
+    assert result is True
+    assert proxy.group_reads.await_count == 0
diff --git a/tests/unit/proxy/management_endpoints/test_access_group_endpoints.py b/tests/unit/proxy/management_endpoints/test_access_group_endpoints.py
index f06008bb0ef..6908e61c96d 100644
--- a/tests/unit/proxy/management_endpoints/test_access_group_endpoints.py
+++ b/tests/unit/proxy/management_endpoints/test_access_group_endpoints.py
@@ -3,8 +3,10 @@ Tests for access group management endpoints.
 """
 
 import types
+from collections.abc import Iterator, Mapping, Sequence
 from contextlib import asynccontextmanager
 from datetime import datetime
+from typing import Final, TypeAlias
 from unittest.mock import AsyncMock, MagicMock
 
 import pytest
@@ -22,6 +24,9 @@ from litellm.proxy.proxy_server import app
 from litellm.types.agents import AgentResponse
 
 
+_ClientAndMocks: TypeAlias = tuple[TestClient, MagicMock, MagicMock, MagicMock, MagicMock]
+
+
 def _make_access_group_record(
     access_group_id: str = "ag-123",
     access_group_name: str = "test-group",
@@ -30,12 +35,13 @@ def _make_access_group_record(
     access_mcp_server_ids: list | None = None,
     access_agent_ids: list | None = None,
     access_skill_names: list | None = None,
+    access_vector_store_ids: Sequence[str] = (),
     assigned_team_ids: list | None = None,
     assigned_key_ids: list | None = None,
     created_by: str | None = "admin-user",
     updated_by: str | None = "admin-user",
     created_at: datetime | None = None,
-):
+) -> MagicMock:
     created_at_val = created_at or datetime.now()
     updated_at_val = datetime.now()
     data = {
@@ -46,6 +52,7 @@ def _make_access_group_record(
         "access_mcp_server_ids": access_mcp_server_ids or [],
         "access_agent_ids": access_agent_ids or [],
         "access_skill_names": access_skill_names or [],
+        "access_vector_store_ids": list(access_vector_store_ids),
         "assigned_team_ids": assigned_team_ids or [],
         "assigned_key_ids": assigned_key_ids or [],
         "created_at": created_at_val,
@@ -78,12 +85,12 @@ def _make_key_record(token: str, key_alias: str | None = None):
 
 
 @pytest.fixture
-def client_and_mocks(monkeypatch):
+def client_and_mocks(monkeypatch: pytest.MonkeyPatch) -> Iterator[_ClientAndMocks]:
     """Setup mock prisma and admin auth for access group endpoints."""
     mock_access_group_table = MagicMock()
     mock_prisma = MagicMock()
 
-    def _create_side_effect(*, data):
+    def _create_side_effect(*, data: Mapping[str, object]) -> MagicMock:
         return _make_access_group_record(
             access_group_id="ag-new",
             access_group_name=data.get("access_group_name", "new"),
@@ -92,6 +99,7 @@ def client_and_mocks(monkeypatch):
             access_mcp_server_ids=data.get("access_mcp_server_ids", []),
             access_agent_ids=data.get("access_agent_ids", []),
             access_skill_names=data.get("access_skill_names", []),
+            access_vector_store_ids=data.get("access_vector_store_ids", []),
             assigned_team_ids=data.get("assigned_team_ids", []),
             assigned_key_ids=data.get("assigned_key_ids", []),
             created_by=data.get("created_by"),
@@ -110,6 +118,7 @@ def client_and_mocks(monkeypatch):
             access_mcp_server_ids=data.get("access_mcp_server_ids", []),
             access_agent_ids=data.get("access_agent_ids", []),
             access_skill_names=data.get("access_skill_names", []),
+            access_vector_store_ids=data.get("access_vector_store_ids", []),
             assigned_team_ids=data.get("assigned_team_ids", []),
             assigned_key_ids=data.get("assigned_key_ids", []),
             updated_by=data.get("updated_by"),
@@ -1714,6 +1723,41 @@ def test_update_access_group_writes_skill_names(client_and_mocks, update_payload
     assert mock_table.update.await_args.kwargs["data"]["access_skill_names"] == expected_skills
 
 
+def test_create_access_group_persists_and_returns_vector_store_ids(client_and_mocks: _ClientAndMocks) -> None:
+    client, _, mock_table, *_ = client_and_mocks
+
+    resp: Final = client.post(
+        "/v1/access_group", json={"access_group_name": "stores", "access_vector_store_ids": ["store-a"]}
+    )
+
+    assert resp.status_code == 201
+    assert resp.json()["access_vector_store_ids"] == ["store-a"]
+    assert mock_table.create.await_args.kwargs["data"]["access_vector_store_ids"] == ["store-a"]
+
+
+@pytest.mark.parametrize(
+    ("update_payload", "expected_stores"),
+    [
+        ({"access_vector_store_ids": ["store-a"]}, ["store-a"]),
+        ({"access_vector_store_ids": []}, []),
+        ({"access_vector_store_ids": None}, []),
+    ],
+)
+def test_update_access_group_writes_vector_store_ids(
+    client_and_mocks: _ClientAndMocks, update_payload: Mapping[str, object], expected_stores: Sequence[str]
+) -> None:
+    client, _, mock_table, *_ = client_and_mocks
+    mock_table.find_unique = AsyncMock(
+        return_value=_make_access_group_record(access_group_id="ag-stores", access_vector_store_ids=["old-store"])
+    )
+
+    resp: Final = client.put("/v1/access_group/ag-stores", json=update_payload)
+
+    assert resp.status_code == 200
+    assert resp.json()["access_vector_store_ids"] == expected_stores
+    assert mock_table.update.await_args.kwargs["data"]["access_vector_store_ids"] == expected_stores
+
+
 def test_update_access_group_without_skill_field_leaves_skills_untouched(client_and_mocks):
     client, _, mock_table, *_ = client_and_mocks
     mock_table.find_unique = AsyncMock(
diff --git a/tests/unit/proxy/vector_store_access_group_state.py b/tests/unit/proxy/vector_store_access_group_state.py
new file mode 100644
index 00000000000..c9d462a9ad4
--- /dev/null
+++ b/tests/unit/proxy/vector_store_access_group_state.py
@@ -0,0 +1,104 @@
+"""Proxy state and identities shared by the vector store access group tests."""
+
+from collections.abc import Sequence
+from typing import Final
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+
+from litellm.models.access_group import LiteLLM_AccessGroupTable
+from litellm.proxy._types import (
+    LiteLLM_ObjectPermissionTable,
+    LiteLLM_TeamTableCachedObj,
+    LitellmUserRoles,
+    UserAPIKeyAuth,
+)
+from litellm.proxy.auth.auth_checks import cache_access_object
+from litellm.proxy.common_utils.user_api_key_cache import UserApiKeyCache
+from litellm.types.vector_stores import LiteLLM_ManagedVectorStore
+
+TOKEN: Final = "hashed-key"
+TEAM_ID: Final = "team-t"
+OTHER_TEAM_ID: Final = "owner-team"
+
+
+class ProxyState:
+    """The proxy globals the checks read: a real cache in front of a database that holds no groups."""
+
+    def __init__(
+        self,
+        monkeypatch: pytest.MonkeyPatch,
+        *,
+        group_reads: AsyncMock | None = None,
+        team_reads: AsyncMock | None = None,
+        store_reads: AsyncMock | None = None,
+        cache: UserApiKeyCache | MagicMock | None = None,
+    ) -> None:
+        self.cache: Final = cache if cache is not None else UserApiKeyCache()
+        self.group_reads: Final = group_reads if group_reads is not None else AsyncMock(return_value=None)
+        self.prisma: Final = MagicMock(
+            db=MagicMock(
+                litellm_accessgrouptable=MagicMock(find_unique=self.group_reads),
+                litellm_teamtable=MagicMock(find_unique=team_reads or AsyncMock(return_value=None)),
+                litellm_managedvectorstorestable=MagicMock(find_unique=store_reads or AsyncMock(return_value=None)),
+            )
+        )
+        monkeypatch.setattr("litellm.proxy.proxy_server.prisma_client", self.prisma)
+        monkeypatch.setattr("litellm.proxy.proxy_server.user_api_key_cache", self.cache)
+
+    async def add_group(
+        self,
+        group_id: str,
+        stores: Sequence[str] = (),
+        *,
+        models: Sequence[str] = (),
+        team_ids: Sequence[str] = (TEAM_ID,),
+        key_ids: Sequence[str] = (TOKEN,),
+    ) -> None:
+        await cache_access_object(
+            access_group_id=group_id,
+            access_group_table=LiteLLM_AccessGroupTable(
+                access_group_id=group_id,
+                access_group_name=group_id,
+                access_model_names=list(models),
+                access_vector_store_ids=tuple(stores),
+                assigned_team_ids=list(team_ids),
+                assigned_key_ids=list(key_ids),
+            ),
+            user_api_key_cache=self.cache,
+        )
+
+    async def add_team(self, team: LiteLLM_TeamTableCachedObj) -> None:
+        await self.cache.async_set_cache(key=f"team_id:{team.team_id}", value=team)
+
+
+def own_permission(stores: Sequence[str] | None) -> LiteLLM_ObjectPermissionTable | None:
+    if stores is None:
+        return None
+    return LiteLLM_ObjectPermissionTable(object_permission_id="own", vector_stores=list(stores))
+
+
+def make_key(
+    own_stores: Sequence[str] | None = None, groups: Sequence[str] = (), team_id: str | None = None
+) -> UserAPIKeyAuth:
+    return UserAPIKeyAuth(
+        token=TOKEN,
+        team_id=team_id,
+        access_group_ids=list(groups),
+        object_permission_id="own" if own_stores is not None else None,
+        object_permission=own_permission(own_stores),
+        user_role=LitellmUserRoles.INTERNAL_USER,
+    )
+
+
+def make_team(own_stores: Sequence[str] | None = None, groups: Sequence[str] = ()) -> LiteLLM_TeamTableCachedObj:
+    return LiteLLM_TeamTableCachedObj(
+        team_id=TEAM_ID,
+        access_group_ids=list(groups),
+        object_permission_id="own" if own_stores is not None else None,
+        object_permission=own_permission(own_stores),
+    )
+
+
+def team_owned_store(store_id: str) -> LiteLLM_ManagedVectorStore:
+    return LiteLLM_ManagedVectorStore(vector_store_id=store_id, custom_llm_provider="openai", team_id=OTHER_TEAM_ID)
diff --git a/tests/unit/proxy/vector_store_endpoints/test_vector_store_access_groups.py b/tests/unit/proxy/vector_store_endpoints/test_vector_store_access_groups.py
new file mode 100644
index 00000000000..f6e4a3ebeac
--- /dev/null
+++ b/tests/unit/proxy/vector_store_endpoints/test_vector_store_access_groups.py
@@ -0,0 +1,431 @@
+"""Group grants open the read gate and the list, and never the manage gate."""
+
+import base64
+import json
+from collections.abc import AsyncIterator, Mapping, Sequence
+from typing import Final
+from unittest.mock import AsyncMock, MagicMock
+
+import httpx
+import pytest
+import respx
+from fastapi.testclient import TestClient
+
+import litellm
+from litellm import Router
+from litellm.proxy._types import UI_TEAM_ID, LiteLLM_TeamTableCachedObj, LiteLLM_UserTable, UserAPIKeyAuth
+from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
+from litellm.proxy.common_utils.user_api_key_cache import UserApiKeyCache
+from litellm.proxy.proxy_server import app
+from litellm.proxy.vector_store_endpoints.utils import (
+    can_user_read_vector_store,
+    filter_listable_vector_stores,
+)
+from litellm.vector_stores.vector_store_registry import VectorStoreRegistry
+from tests.unit.proxy.vector_store_access_group_state import (
+    TEAM_ID,
+    TOKEN,
+    ProxyState,
+    make_key,
+    make_team,
+    team_owned_store,
+)
+
+
+@pytest.fixture
+def proxy(monkeypatch: pytest.MonkeyPatch) -> ProxyState:
+    return ProxyState(monkeypatch)
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    ("store_id", "allowed"),
+    [pytest.param("store-a", True, id="group-store"), pytest.param("store-b", False, id="other-store")],
+)
+async def test_search_and_files_gate_counts_team_group_stores(proxy: ProxyState, store_id: str, allowed: bool) -> None:
+    await proxy.add_group("g1", ("store-a",))
+    await proxy.add_team(make_team(groups=("g1",)))
+
+    assert await can_user_read_vector_store(team_owned_store(store_id), make_key(team_id=TEAM_ID)) is allowed
+
+
+@pytest.mark.asyncio
+async def test_search_and_files_gate_counts_a_personal_keys_group_stores(proxy: ProxyState) -> None:
+    await proxy.add_group("g1", ("store-a",))
+
+    assert await can_user_read_vector_store(team_owned_store("store-a"), make_key(groups=("g1",))) is True
+    assert await can_user_read_vector_store(team_owned_store("store-b"), make_key(groups=("g1",))) is False
+
+
+@pytest.mark.asyncio
+async def test_models_only_group_grants_nothing_on_search_and_list(proxy: ProxyState) -> None:
+    await proxy.add_group("models-only", models=("gpt-4",))
+    await proxy.add_team(make_team(groups=("models-only",)))
+
+    assert await can_user_read_vector_store(team_owned_store("store-a"), make_key(team_id=TEAM_ID)) is False
+    assert await filter_listable_vector_stores((team_owned_store("store-a"),), make_key(team_id=TEAM_ID)) == ()
+
+
+@pytest.mark.asyncio
+async def test_direct_grant_never_reads_teams_or_groups(monkeypatch: pytest.MonkeyPatch) -> None:
+    team_reads: Final = AsyncMock(side_effect=RuntimeError("database unavailable"))
+    proxy: Final = ProxyState(monkeypatch, team_reads=team_reads)
+
+    assert (
+        await can_user_read_vector_store(team_owned_store("store-a"), make_key(("store-a",), team_id=TEAM_ID)) is True
+    )
+    assert team_reads.await_count == 0
+    assert proxy.group_reads.await_count == 0
+
+
+@pytest.mark.asyncio
+async def test_list_shows_only_granted_stores(proxy: ProxyState) -> None:
+    await proxy.add_group("g1", ("store-a",))
+    await proxy.add_team(make_team(groups=("g1",)))
+
+    listed: Final = await filter_listable_vector_stores(
+        (team_owned_store("store-a"), team_owned_store("store-b")), make_key(team_id=TEAM_ID)
+    )
+
+    assert listed == (team_owned_store("store-a"),)
+
+
+@pytest.mark.asyncio
+async def test_list_reads_the_group_once_however_many_stores_exist(monkeypatch: pytest.MonkeyPatch) -> None:
+    cache: Final = MagicMock(wraps=UserApiKeyCache())
+    proxy: Final = ProxyState(monkeypatch, cache=cache)
+    await proxy.add_group("g1", ("store-a",))
+    await proxy.add_team(make_team(groups=("g1",)))
+
+    await filter_listable_vector_stores(
+        (team_owned_store("store-a"), team_owned_store("store-b"), team_owned_store("store-c")),
+        make_key(team_id=TEAM_ID),
+    )
+
+    group_lookups: Final = [
+        call for call in cache.async_get_cache.call_args_list if call.kwargs["key"] == "access_group_id:g1"
+    ]
+    assert len(group_lookups) == 1
+
+
+@pytest.mark.asyncio
+async def test_unreadable_group_grants_nothing_on_search_and_list(monkeypatch: pytest.MonkeyPatch) -> None:
+    proxy: Final = ProxyState(monkeypatch, group_reads=AsyncMock(side_effect=RuntimeError("database unavailable")))
+    await proxy.add_team(make_team(groups=("g1",)))
+
+    assert await can_user_read_vector_store(team_owned_store("store-a"), make_key(team_id=TEAM_ID)) is False
+    assert await filter_listable_vector_stores((team_owned_store("store-a"),), make_key(team_id=TEAM_ID)) == ()
+
+
+@pytest.mark.asyncio
+async def test_one_unreadable_group_drops_the_readable_groups_grants_too(monkeypatch: pytest.MonkeyPatch) -> None:
+    proxy: Final = ProxyState(monkeypatch, group_reads=AsyncMock(side_effect=RuntimeError("database unavailable")))
+    await proxy.add_group("g1", ("store-a",))
+    await proxy.add_team(make_team(groups=("g1", "unreadable")))
+
+    assert await can_user_read_vector_store(team_owned_store("store-a"), make_key(team_id=TEAM_ID)) is False
+
+
+@pytest.mark.asyncio
+async def test_failed_team_read_grants_nothing_and_keeps_direct_grants(monkeypatch: pytest.MonkeyPatch) -> None:
+    ProxyState(monkeypatch, team_reads=AsyncMock(side_effect=RuntimeError("database unavailable")))
+
+    assert await can_user_read_vector_store(team_owned_store("store-a"), make_key(team_id=TEAM_ID)) is False
+    assert (
+        await can_user_read_vector_store(team_owned_store("store-a"), make_key(("store-a",), team_id=TEAM_ID)) is True
+    )
+    listed: Final = await filter_listable_vector_stores(
+        (team_owned_store("store-a"),), make_key(("store-a",), team_id=TEAM_ID)
+    )
+    assert listed == (team_owned_store("store-a"),)
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    ("key_stores", "key_groups", "team_groups", "store", "allowed"),
+    [
+        pytest.param(None, (), ("team-a",), "store-a", True, id="team-group-and-unrestricted-key"),
+        pytest.param(("store-x",), (), ("team-a",), "store-a", False, id="key-own-list-narrows-team-group"),
+        pytest.param(None, ("key-b",), ("team-a",), "store-a", False, id="key-group-narrows-team-group"),
+        pytest.param(None, ("key-b",), ("team-a",), "store-b", False, id="team-group-narrows-key-group"),
+        pytest.param(None, ("team-a",), ("team-a",), "store-a", True, id="both-layers-list-the-store"),
+        pytest.param(("store-a",), (), ("team-a",), "store-a", True, id="key-own-list-agrees-with-team-group"),
+    ],
+)
+async def test_read_gate_and_list_apply_the_request_checks_rule_to_group_grants(
+    proxy: ProxyState,
+    key_stores: Sequence[str] | None,
+    key_groups: Sequence[str],
+    team_groups: Sequence[str],
+    store: str,
+    allowed: bool,
+) -> None:
+    await proxy.add_group("team-a", ("store-a",))
+    await proxy.add_group("key-b", ("store-b",))
+    await proxy.add_team(make_team(groups=team_groups))
+    key: Final = make_key(key_stores, key_groups, TEAM_ID)
+
+    assert await can_user_read_vector_store(team_owned_store(store), key) is allowed
+    listed: Final = await filter_listable_vector_stores((team_owned_store(store),), key)
+    assert listed == ((team_owned_store(store),) if allowed else ())
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    ("key_groups", "allowed"),
+    [pytest.param((), False, id="only-the-team-grants"), pytest.param(("g1",), True, id="key-and-team-grant")],
+)
+async def test_read_gate_requires_both_layers_under_deny_by_default(
+    proxy: ProxyState, monkeypatch: pytest.MonkeyPatch, key_groups: Sequence[str], allowed: bool
+) -> None:
+    monkeypatch.setattr("litellm.proxy.proxy_server.general_settings", {"vector_store_deny_by_default": True})
+    await proxy.add_group("g1", ("store-a",))
+    await proxy.add_team(make_team(groups=("g1",)))
+    key: Final = UserAPIKeyAuth(token=TOKEN, api_key=TOKEN, team_id=TEAM_ID, access_group_ids=list(key_groups))
+    key.via_virtual_key = True
+
+    assert await can_user_read_vector_store(team_owned_store("store-a"), key) is allowed
+
+
+@pytest.mark.asyncio
+async def test_read_gate_and_list_match_a_group_store_by_its_provider_id(proxy: ProxyState) -> None:
+    managed_id: Final = base64.urlsafe_b64encode(
+        b"litellm_proxy:vector_store;unified_id,abc;target_model_names,gpt-4;resource_id,store-a"
+    ).decode()
+    await proxy.add_group("g1", (managed_id,))
+    await proxy.add_team(make_team(groups=("g1",)))
+    key: Final = make_key(team_id=TEAM_ID)
+
+    assert await can_user_read_vector_store(team_owned_store("store-a"), key) is True
+    assert await filter_listable_vector_stores((team_owned_store("store-a"),), key) == (team_owned_store("store-a"),)
+    assert await can_user_read_vector_store(team_owned_store("store-b"), key) is False
+    assert await can_user_read_vector_store(team_owned_store(managed_id), key) is True
+
+
+@pytest.mark.asyncio
+async def test_group_grant_for_one_managed_store_does_not_open_another_with_the_same_provider_id(
+    proxy: ProxyState,
+) -> None:
+    def managed_id(unified_id: str) -> str:
+        return base64.urlsafe_b64encode(
+            f"litellm_proxy:vector_store;unified_id,{unified_id};target_model_names,gpt-4;resource_id,vs_shared".encode()
+        ).decode()
+
+    await proxy.add_group("g1", (managed_id("granted"),))
+    await proxy.add_team(make_team(groups=("g1",)))
+    key: Final = make_key(team_id=TEAM_ID)
+
+    assert await can_user_read_vector_store(team_owned_store(managed_id("granted")), key) is True
+    assert await can_user_read_vector_store(team_owned_store(managed_id("other")), key) is False
+    assert await filter_listable_vector_stores((team_owned_store(managed_id("other")),), key) == ()
+
+
+@pytest.mark.asyncio
+async def test_dashboard_session_gets_the_group_stores_of_each_of_the_users_teams(proxy: ProxyState) -> None:
+    await proxy.add_group("g1", ("store-a",), team_ids=("team-1",))
+    await proxy.add_group("g2", ("store-c",), team_ids=("team-2",))
+    await proxy.cache.async_set_cache(
+        key="team_id:team-1", value=LiteLLM_TeamTableCachedObj(team_id="team-1", access_group_ids=["g1"])
+    )
+    await proxy.cache.async_set_cache(
+        key="team_id:team-2", value=LiteLLM_TeamTableCachedObj(team_id="team-2", access_group_ids=["g2"])
+    )
+    await proxy.cache.async_set_cache(
+        key="session-user", value=LiteLLM_UserTable(user_id="session-user", teams=["team-1", "team-2"])
+    )
+    session: Final = UserAPIKeyAuth(token=TOKEN, user_id="session-user", team_id=UI_TEAM_ID)
+    stores: Final = tuple(team_owned_store(store_id) for store_id in ("store-a", "store-b", "store-c"))
+
+    assert await filter_listable_vector_stores(stores, session) == (stores[0], stores[2])
+    assert await can_user_read_vector_store(stores[0], session) is True
+    assert await can_user_read_vector_store(stores[1], session) is False
+    assert await can_user_read_vector_store(stores[2], session) is True
+
+
+READ_ROUTES: Final = (
+    pytest.param("POST", "/v1/vector_stores/{}/search", {"query": "hi"}, id="search"),
+    pytest.param("GET", "/v1/vector_stores/{}", None, id="retrieve"),
+    pytest.param("GET", "/v1/vector_stores/{}/files", None, id="file-list"),
+    pytest.param("GET", "/v1/vector_stores/{}/files/file-1", None, id="file-retrieve"),
+    pytest.param("GET", "/v1/vector_stores/{}/files/file-1/content", None, id="file-content"),
+    pytest.param("POST", "/vector_store/info", {"vector_store_id": "{}"}, id="info"),
+    pytest.param(
+        "POST",
+        "/v1/rag/query",
+        {"model": "m", "messages": [{"role": "user", "content": "hi"}], "retrieval_config": {"vector_store_id": "{}"}},
+        id="rag-query",
+    ),
+    pytest.param(
+        "POST",
+        "/v1/responses",
+        {"model": "m", "input": "hi", "tools": [{"type": "file_search", "vector_store_ids": ["{}"]}]},
+        id="responses",
+    ),
+)
+
+MANAGE_ROUTES: Final = (
+    pytest.param(
+        "POST", "/vector_store/update", {"vector_store_id": "{}", "vector_store_name": "renamed"}, id="update"
+    ),
+    pytest.param("POST", "/vector_store/delete", {"vector_store_id": "{}"}, id="delete"),
+    pytest.param("POST", "/v1/vector_stores/{}", {"name": "renamed"}, id="provider-update"),
+    pytest.param("DELETE", "/v1/vector_stores/{}", None, id="provider-delete"),
+    pytest.param("POST", "/v1/vector_stores/{}/files", {"file_id": "file-1"}, id="file-create"),
+    pytest.param("POST", "/v1/vector_stores/{}/files/file-1", {"attributes": {"topic": "parks"}}, id="file-update"),
+    pytest.param("DELETE", "/v1/vector_stores/{}/files/file-1", None, id="file-delete"),
+)
+
+
+def _body_for(body: Mapping[str, object] | None, store_id: str) -> object:
+    return None if body is None else json.loads(json.dumps(body).replace("{}", store_id))
+
+
+def _openai_answer(request: httpx.Request) -> httpx.Response:
+    path: Final = request.url.path
+    if path.endswith("/responses"):
+        return httpx.Response(
+            200,
+            json={
+                "id": "resp_1",
+                "object": "response",
+                "created_at": 1,
+                "status": "completed",
+                "model": "gpt-4o-mini",
+                "output": [],
+                "parallel_tool_calls": True,
+                "tool_choice": "auto",
+                "tools": [],
+                "usage": {"input_tokens": 1, "output_tokens": 1, "total_tokens": 2},
+            },
+        )
+    if path.endswith("/chat/completions"):
+        return httpx.Response(
+            200,
+            json={
+                "id": "chat_1",
+                "object": "chat.completion",
+                "created": 1,
+                "model": "gpt-4o-mini",
+                "choices": [{"index": 0, "finish_reason": "stop", "message": {"role": "assistant", "content": "hi"}}],
+                "usage": {"prompt_tokens": 1, "completion_tokens": 1, "total_tokens": 2},
+            },
+        )
+    if path.endswith("/search"):
+        return httpx.Response(
+            200,
+            json={
+                "object": "vector_store.search_results.page",
+                "search_query": "hi",
+                "data": [],
+                "has_more": False,
+                "next_page": None,
+            },
+        )
+    if path.endswith("/files"):
+        return httpx.Response(
+            200, json={"object": "list", "data": [], "first_id": None, "last_id": None, "has_more": False}
+        )
+    if path.endswith("/content"):
+        return httpx.Response(200, json={"object": "vector_store.file_content.page", "data": [], "has_more": False})
+    if "/files/" in path:
+        return httpx.Response(
+            200,
+            json={
+                "id": "file-1",
+                "object": "vector_store.file",
+                "created_at": 1,
+                "usage_bytes": 0,
+                "vector_store_id": "store-a",
+                "status": "completed",
+            },
+        )
+    return httpx.Response(
+        200,
+        json={
+            "id": "store-a",
+            "object": "vector_store",
+            "created_at": 1,
+            "name": "store-a",
+            "usage_bytes": 0,
+            "file_counts": {"in_progress": 0, "completed": 0, "failed": 0, "cancelled": 0, "total": 0},
+            "status": "completed",
+            "metadata": {},
+        },
+    )
+
+
+@pytest.fixture
+async def group_member(
+    monkeypatch: pytest.MonkeyPatch, respx_mock: respx.MockRouter, httpx_transport: None
+) -> AsyncIterator[TestClient]:
+    """A client for a team key whose team's group lists store-a. Another team owns both stores, and OpenAI is stubbed."""
+    respx_mock.route(host="api.openai.com").mock(side_effect=_openai_answer)
+    monkeypatch.setenv("OPENAI_API_KEY", "sk-test")
+    monkeypatch.setattr(
+        "litellm.proxy.proxy_server.llm_router",
+        Router(
+            model_list=[{"model_name": "m", "litellm_params": {"model": "openai/gpt-4o-mini", "api_key": "sk-test"}}]
+        ),
+    )
+    stores: Final = {store_id: team_owned_store(store_id) for store_id in ("store-a", "store-b")}
+    proxy: Final = ProxyState(
+        monkeypatch,
+        store_reads=AsyncMock(
+            side_effect=lambda where: MagicMock(model_dump=MagicMock(return_value=stores[where["vector_store_id"]]))
+        ),
+    )
+    await proxy.add_group("g1", ("store-a",))
+    await proxy.add_team(make_team(groups=("g1",)))
+    monkeypatch.setattr(litellm, "vector_store_registry", VectorStoreRegistry(vector_stores=list(stores.values())))
+    original_overrides: Final = app.dependency_overrides.copy()
+    app.dependency_overrides[user_api_key_auth] = lambda: make_key(team_id=TEAM_ID)
+    try:
+        yield TestClient(app, raise_server_exceptions=False)
+    finally:
+        app.dependency_overrides = original_overrides
+
+
+def _send(client: TestClient, method: str, path: str, body: Mapping[str, object] | None, store_id: str) -> int:
+    return client.request(method, path.format(store_id), json=_body_for(body, store_id)).status_code
+
+
+@pytest.mark.parametrize(("method", "path", "body"), READ_ROUTES)
+def test_read_routes_serve_a_group_member_only_group_stores(
+    group_member: TestClient, method: str, path: str, body: Mapping[str, object] | None
+) -> None:
+    assert _send(group_member, method, path, body, "store-a") == 200
+    assert _send(group_member, method, path, body, "store-b") == 403
+
+
+@pytest.mark.parametrize(("method", "path", "body"), MANAGE_ROUTES)
+def test_manage_routes_refuse_a_group_member(
+    group_member: TestClient, method: str, path: str, body: Mapping[str, object] | None
+) -> None:
+    assert _send(group_member, method, path, body, "store-a") == 403
+
+
+def test_info_reads_a_database_store_through_the_read_gate(
+    group_member: TestClient, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    monkeypatch.setattr(litellm, "vector_store_registry", None)
+
+    assert group_member.post("/vector_store/info", json={"vector_store_id": "store-a"}).status_code == 200
+    assert group_member.post("/vector_store/info", json={"vector_store_id": "store-b"}).status_code == 403
+
+
+def test_info_refuses_a_group_store_the_keys_own_list_excludes(group_member: TestClient) -> None:
+    app.dependency_overrides[user_api_key_auth] = lambda: make_key(("store-x",), team_id=TEAM_ID)
+
+    assert group_member.post("/vector_store/info", json={"vector_store_id": "store-a"}).status_code == 403
+
+
+def test_rag_ingest_refuses_a_group_member(group_member: TestClient) -> None:
+    response: Final = group_member.post(
+        "/v1/rag/ingest",
+        json={
+            "ingest_options": {"vector_store": {"custom_llm_provider": "openai", "vector_store_id": "store-a"}},
+            "file_url": "https://example.com/a.txt",
+        },
+    )
+
+    assert response.status_code == 403
diff --git a/tests/unit/proxy/vector_store_endpoints/test_vector_store_endpoints.py b/tests/unit/proxy/vector_store_endpoints/test_vector_store_endpoints.py
index fa4a1656bc3..f872f0d2a25 100644
--- a/tests/unit/proxy/vector_store_endpoints/test_vector_store_endpoints.py
+++ b/tests/unit/proxy/vector_store_endpoints/test_vector_store_endpoints.py
@@ -26,6 +26,7 @@ from litellm.proxy.vector_store_endpoints.management_endpoints import (
     new_vector_store,
 )
 from litellm.proxy.vector_store_endpoints.utils import (
+    assert_user_can_access_vector_store,
     check_vector_store_permission,
     is_allowed_to_call_vector_store_endpoint,
     is_allowed_to_call_vector_store_files_endpoint,
@@ -659,7 +660,7 @@ async def test_update_request_data_with_litellm_managed_vector_store_registry():
     # Test with vector store registry
     with patch.object(litellm, "vector_store_registry", mock_registry):
         result = await _update_request_data_with_litellm_managed_vector_store_registry(
-            data=data, vector_store_id=vector_store_id
+            data=data, vector_store_id=vector_store_id, authorize=assert_user_can_access_vector_store
         )
 
         # Verify the data was updated correctly
@@ -681,7 +682,7 @@ async def test_update_request_data_with_litellm_managed_vector_store_registry():
     ):
         original_data = {"existing_key": "existing_value"}
         result = await _update_request_data_with_litellm_managed_vector_store_registry(
-            data=original_data, vector_store_id=vector_store_id
+            data=original_data, vector_store_id=vector_store_id, authorize=assert_user_can_access_vector_store
         )
 
         # Verify data remains unchanged when no registry
@@ -706,6 +707,7 @@ async def test_managed_vector_store_keeps_embedding_reference_and_explicit_confi
         result = await _update_request_data_with_litellm_managed_vector_store_registry(
             data={},
             vector_store_id="test_store",
+            authorize=assert_user_can_access_vector_store,
         )
 
     assert result["litellm_embedding_model"] == "team-embedding-alias"
diff --git a/tests/unit/proxy/vector_store_endpoints/test_vector_store_tenant_guard.py b/tests/unit/proxy/vector_store_endpoints/test_vector_store_tenant_guard.py
index 434ea6f3f97..3daf02fa1f7 100644
--- a/tests/unit/proxy/vector_store_endpoints/test_vector_store_tenant_guard.py
+++ b/tests/unit/proxy/vector_store_endpoints/test_vector_store_tenant_guard.py
@@ -194,7 +194,7 @@ async def test_vector_store_file_list_resolves_managed_ids_and_cursors():
 
     with (
         patch(
-            "litellm.proxy.vector_store_files_endpoints.endpoints.assert_user_can_access_vector_store_id",
+            "litellm.proxy.vector_store_files_endpoints.endpoints.assert_user_can_read_vector_store_id",
             new=AsyncMock(return_value=None),
         ),
         patch("litellm.proxy.proxy_server.llm_router", llm_router),
diff --git a/ui/litellm-dashboard/src/lib/http/schema.d.ts b/ui/litellm-dashboard/src/lib/http/schema.d.ts
index 6e0a7898b6e..5a4d8a6239a 100644
--- a/ui/litellm-dashboard/src/lib/http/schema.d.ts
+++ b/ui/litellm-dashboard/src/lib/http/schema.d.ts
@@ -26098,6 +26098,8 @@ export interface components {
             access_model_names?: string[] | null;
             /** Access Skill Names */
             access_skill_names?: string[] | null;
+            /** Access Vector Store Ids */
+            access_vector_store_ids?: string[] | null;
             /** Assigned Key Ids */
             assigned_key_ids?: string[] | null;
             /** Assigned Team Ids */
@@ -26152,6 +26154,11 @@ export interface components {
              * @default []
              */
             access_skill_names: string[];
+            /**
+             * Access Vector Store Ids
+             * @default []
+             */
+            access_vector_store_ids: string[];
             /** Assigned Key Ids */
             assigned_key_ids: string[];
             /** Assigned Keys */
@@ -26193,6 +26200,8 @@ export interface components {
             access_model_names?: string[] | null;
             /** Access Skill Names */
             access_skill_names?: string[] | null;
+            /** Access Vector Store Ids */
+            access_vector_store_ids?: string[] | null;
             /** Assigned Key Ids */
             assigned_key_ids?: string[] | null;
             /** Assigned Team Ids */