diff --git a/litellm/proxy/management_endpoints/ui_sso.py b/litellm/proxy/management_endpoints/ui_sso.py
index 065464aa565..8f29e251be6 100644
--- a/litellm/proxy/management_endpoints/ui_sso.py
+++ b/litellm/proxy/management_endpoints/ui_sso.py
@@ -12,6 +12,7 @@ import asyncio
 import base64
 import hashlib
 import inspect
+import json
 import os
 import re
 import secrets
@@ -245,18 +246,28 @@ def _get_cli_sso_flow_or_raise(login_id: Optional[str], cache: DualCache) -> dic
         raise HTTPException(status_code=400, detail="Invalid CLI login session")
 
     cache_key = _get_cli_sso_flow_cache_key(cast(str, login_id))
-    flow = cache.get_cache(key=cache_key)
+    redis_cache = cache.redis_cache
+    if redis_cache is not None:
+        flow = redis_cache.get_cache(key=cache_key)
+    else:
+        flow = cache.get_cache(key=cache_key)
+    if isinstance(flow, str):
+        try:
+            flow = json.loads(flow)
+        except ValueError:
+            flow = None
     if not isinstance(flow, dict) or "poll_secret_hash" not in flow:
         raise HTTPException(status_code=400, detail="Invalid CLI login session")
     return flow
 
 
 def _set_cli_sso_flow(login_id: str, cache: DualCache, flow: dict) -> None:
-    cache.set_cache(
-        key=_get_cli_sso_flow_cache_key(login_id),
-        value=flow,
-        ttl=CLI_SSO_SESSION_TTL_SECONDS,
-    )
+    cache_key = _get_cli_sso_flow_cache_key(login_id)
+    redis_cache = cache.redis_cache
+    if redis_cache is not None:
+        redis_cache.set_cache(key=cache_key, value=json.dumps(flow), ttl=CLI_SSO_SESSION_TTL_SECONDS)
+    else:
+        cache.set_cache(key=cache_key, value=flow, ttl=CLI_SSO_SESSION_TTL_SECONDS)
 
 
 def _verify_cli_sso_poll_secret(flow: dict, poll_secret: Optional[str]) -> bool:
@@ -567,11 +578,11 @@ def _render_cli_sso_verification_page(
 
 @router.post("/sso/cli/start", tags=["experimental"], include_in_schema=False)
 async def cli_sso_start(request: Request):
-    from litellm.proxy.proxy_server import general_settings, user_api_key_cache
+    from litellm.proxy.proxy_server import cli_sso_session_cache, general_settings
 
     _check_cli_sso_start_rate_limit(
         request=request,
-        cache=user_api_key_cache,
+        cache=cli_sso_session_cache,
         use_x_forwarded_for=bool((general_settings or {}).get("use_x_forwarded_for", False)),
     )
 
@@ -586,7 +597,7 @@ async def cli_sso_start(request: Request):
         "user_code_verified": False,
         "session_data": None,
     }
-    _set_cli_sso_flow(login_id=login_id, cache=user_api_key_cache, flow=flow)
+    _set_cli_sso_flow(login_id=login_id, cache=cli_sso_session_cache, flow=flow)
 
     verification_uri_complete: str | None = (
         (
@@ -618,9 +629,9 @@ async def cli_sso_complete(request: Request, login_id: str):
     from litellm.proxy.common_utils.html_forms.cli_sso_success import (
         render_cli_sso_success_page,
     )
-    from litellm.proxy.proxy_server import user_api_key_cache
+    from litellm.proxy.proxy_server import cli_sso_session_cache
 
-    flow = _get_cli_sso_flow_or_raise(login_id=login_id, cache=user_api_key_cache)
+    flow = _get_cli_sso_flow_or_raise(login_id=login_id, cache=cli_sso_session_cache)
     if not flow.get("sso_complete") or not flow.get("session_data"):
         raise HTTPException(status_code=400, detail="CLI login is not ready")
 
@@ -644,7 +655,7 @@ async def cli_sso_complete(request: Request, login_id: str):
         raise HTTPException(status_code=400, detail="Invalid verification code")
 
     flow["user_code_verified"] = True
-    _set_cli_sso_flow(login_id=login_id, cache=user_api_key_cache, flow=flow)
+    _set_cli_sso_flow(login_id=login_id, cache=cli_sso_session_cache, flow=flow)
 
     html_content = render_cli_sso_success_page()
     return HTMLResponse(content=html_content, status_code=200)
@@ -835,10 +846,10 @@ async def google_login(
     Example:
     """
     from litellm.proxy.proxy_server import (
+        cli_sso_session_cache,
         general_settings,
         premium_user,
         prisma_client,
-        user_api_key_cache,
         user_custom_ui_sso_sign_in_handler,
     )
 
@@ -886,7 +897,7 @@ async def google_login(
     )
 
     if source == LITELLM_CLI_SOURCE_IDENTIFIER:
-        _get_cli_sso_flow_or_raise(login_id=key, cache=user_api_key_cache)
+        _get_cli_sso_flow_or_raise(login_id=key, cache=cli_sso_session_cache)
 
     # Store CLI login handle in state for OAuth flow
     cli_state: Optional[str] = SSOAuthenticationHandler._get_cli_state(
@@ -1920,6 +1931,7 @@ async def _complete_cli_sso_callback_session(
     user_defined_values: Optional[SSOUserDefinedValues],
     prisma_client: PrismaClient,
     user_api_key_cache: UserApiKeyCache,
+    cli_sso_session_cache: DualCache,
     proxy_logging_obj: ProxyLogging,
     prefill_user_code: str | None = None,
 ):
@@ -1966,7 +1978,7 @@ async def _complete_cli_sso_callback_session(
     flow["sso_complete"] = True
     browser_complete_token = secrets.token_urlsafe(32)
     flow["browser_complete_token_hash"] = _hash_cli_sso_secret(browser_complete_token)
-    _set_cli_sso_flow(login_id=key, cache=user_api_key_cache, flow=flow)
+    _set_cli_sso_flow(login_id=key, cache=cli_sso_session_cache, flow=flow)
 
     verbose_proxy_logger.info(
         f"Stored CLI SSO session for user: {user_info.user_id}, teams: {teams}, num_teams: {len(teams)}"
@@ -1996,13 +2008,14 @@ async def cli_sso_callback(
     verbose_proxy_logger.info("CLI SSO callback")
 
     from litellm.proxy.proxy_server import (
+        cli_sso_session_cache,
         general_settings,
         prisma_client,
         proxy_logging_obj,
         user_api_key_cache,
     )
 
-    flow = _get_cli_sso_flow_or_raise(login_id=key, cache=user_api_key_cache)
+    flow = _get_cli_sso_flow_or_raise(login_id=key, cache=cli_sso_session_cache)
 
     if prisma_client is None:
         raise HTTPException(status_code=500, detail=CommonProxyErrors.db_not_connected_error.value)
@@ -2042,6 +2055,7 @@ async def cli_sso_callback(
             user_defined_values=user_defined_values,
             prisma_client=prisma_client,
             user_api_key_cache=user_api_key_cache,
+            cli_sso_session_cache=cli_sso_session_cache,
             proxy_logging_obj=proxy_logging_obj,
             prefill_user_code=prefill_user_code,
         )
@@ -2076,10 +2090,14 @@ async def cli_poll_key(
         get_team_object,
         get_user_object,
     )
-    from litellm.proxy.proxy_server import prisma_client, user_api_key_cache
+    from litellm.proxy.proxy_server import (
+        cli_sso_session_cache,
+        prisma_client,
+        user_api_key_cache,
+    )
 
     try:
-        flow = _get_cli_sso_flow_or_raise(login_id=key_id, cache=user_api_key_cache)
+        flow = _get_cli_sso_flow_or_raise(login_id=key_id, cache=cli_sso_session_cache)
         if not _verify_cli_sso_poll_secret(flow=flow, poll_secret=x_litellm_cli_poll_secret):
             raise HTTPException(status_code=403, detail="Invalid CLI polling secret")
 
@@ -2186,7 +2204,7 @@ async def cli_poll_key(
             )
 
             # Delete cache entry (single-use)
-            user_api_key_cache.delete_cache(key=_get_cli_sso_flow_cache_key(key_id))
+            cli_sso_session_cache.delete_cache(key=_get_cli_sso_flow_cache_key(key_id))
 
             verbose_proxy_logger.info(f"CLI JWT generated for user: {user_id}, team: {team_id}")
             poll_response = {
diff --git a/litellm/proxy/proxy_server.py b/litellm/proxy/proxy_server.py
index 0013e3f77ee..ed7d36b56c1 100644
--- a/litellm/proxy/proxy_server.py
+++ b/litellm/proxy/proxy_server.py
@@ -224,6 +224,7 @@ from litellm.constants import (
     APSCHEDULER_MAX_INSTANCES,
     APSCHEDULER_MISFIRE_GRACE_TIME,
     APSCHEDULER_REPLACE_EXISTING,
+    CLI_SSO_SESSION_TTL_SECONDS,
     DAYS_IN_A_MONTH,
     DEFAULT_HEALTH_CHECK_INTERVAL,
     DEFAULT_MODEL_CREATED_AT_TIME,
@@ -1909,6 +1910,7 @@ user_api_key_cache: UserApiKeyCache = UserApiKeyCache(
     default_in_memory_ttl=UserAPIKeyCacheTTLEnum.in_memory_cache_ttl.value
 )
 spend_counter_cache = DualCache(default_in_memory_ttl=UserAPIKeyCacheTTLEnum.in_memory_cache_ttl.value)
+cli_sso_session_cache = DualCache(default_in_memory_ttl=CLI_SSO_SESSION_TTL_SECONDS)
 model_max_budget_limiter = _PROXY_VirtualKeyModelMaxBudgetLimiter(dual_cache=user_api_key_cache)
 litellm.logging_callback_manager.add_litellm_callback(model_max_budget_limiter)
 redis_usage_cache: Optional[RedisCache] = None  # redis cache used for tracking spend, tpm/rpm limits
@@ -3632,13 +3634,22 @@ def _build_redis_usage_cache_from_environment() -> RedisCache | None:
 def _attach_redis_usage_cache(redis_cache: RedisCache, enable_redis_auth_cache: bool) -> None:
     """
     Wires an established coordination Redis into the proxy-level caches that
-    consume it directly: the spend counter cache, the cluster-wide config
-    cache, and (only when opted in) the virtual-key auth cache.
+    consume it directly: the spend counter cache, the CLI SSO login-session
+    cache, the cluster-wide config cache, and (only when opted in) the
+    virtual-key auth cache.
+
+    The CLI SSO login-session cache is always backed by Redis when available so
+    that the browser SSO flow behind `lite login` survives landing on different
+    workers; it must not be gated behind enable_redis_auth_cache.
     """
     spend_counter_cache.attach_redis_cache(
         redis_cache,
         default_redis_ttl=litellm.default_redis_ttl,
     )
+    cli_sso_session_cache.attach_redis_cache(
+        redis_cache,
+        default_redis_ttl=CLI_SSO_SESSION_TTL_SECONDS,
+    )
     if enable_redis_auth_cache is True:
         user_api_key_cache.attach_redis_cache(
             redis_cache,
diff --git a/tests/test_litellm/proxy/management_endpoints/test_ui_sso.py b/tests/test_litellm/proxy/management_endpoints/test_ui_sso.py
index 045e15f8b8b..95ac0d1d8e2 100644
--- a/tests/test_litellm/proxy/management_endpoints/test_ui_sso.py
+++ b/tests/test_litellm/proxy/management_endpoints/test_ui_sso.py
@@ -2139,6 +2139,93 @@ class TestCLIKeyRegenerationFlow:
         assert not _is_valid_cli_sso_login_id("cli-test\x001234567890")
         assert not _is_valid_cli_sso_login_id("sk-test1234567890")
 
+    def test_cli_sso_flow_is_redis_authoritative_when_redis_attached(self):
+        """
+        When Redis is attached, the CLI SSO flow must be read from and written to
+        Redis directly, never the in-memory layer. Otherwise the worker that served
+        /sso/cli/start keeps serving its stale in-memory flow and never sees the
+        sso_complete/session_data update another worker wrote, which is exactly the
+        multi-worker failure this fix targets.
+        """
+        from litellm.proxy.management_endpoints.ui_sso import (
+            CLI_SSO_SESSION_TTL_SECONDS,
+            _get_cli_sso_flow_cache_key,
+            _get_cli_sso_flow_or_raise,
+            _set_cli_sso_flow,
+        )
+
+        login_id = "cli-redis_authoritative_1234567890"
+        cache_key = _get_cli_sso_flow_cache_key(login_id)
+        fresh_flow = {"poll_secret_hash": "fresh", "sso_complete": True}
+        stale_flow = {"poll_secret_hash": "stale", "sso_complete": False}
+
+        redis_cache = MagicMock()
+        redis_cache.get_cache.return_value = fresh_flow
+        cache = MagicMock()
+        cache.redis_cache = redis_cache
+        cache.get_cache.return_value = stale_flow
+
+        result = _get_cli_sso_flow_or_raise(login_id=login_id, cache=cache)
+
+        assert result == fresh_flow
+        redis_cache.get_cache.assert_called_once_with(key=cache_key)
+        cache.get_cache.assert_not_called()
+
+        _set_cli_sso_flow(login_id=login_id, cache=cache, flow=fresh_flow)
+
+        redis_cache.set_cache.assert_called_once_with(
+            key=cache_key, value=json.dumps(fresh_flow), ttl=CLI_SSO_SESSION_TTL_SECONDS
+        )
+        cache.set_cache.assert_not_called()
+
+    def test_cli_sso_flow_with_enum_survives_redis_round_trip(self):
+        """
+        RedisCache stores values via str(value) and reads them back through
+        json.loads/ast.literal_eval. A raw flow dict containing a Python enum
+        (session_data.user_role after the SSO callback) produces an unparseable
+        repr, so every worker reading the completed flow from Redis got a
+        SyntaxError and returned 400 "session not found". The flow must survive
+        a real Redis serialization round trip.
+        """
+        from litellm.caching.redis_cache import RedisCache
+        from litellm.proxy._types import LitellmUserRoles
+        from litellm.proxy.management_endpoints.ui_sso import (
+            _get_cli_sso_flow_or_raise,
+            _set_cli_sso_flow,
+        )
+
+        login_id = "cli-enum_round_trip_1234567890"
+        completed_flow = {
+            "poll_secret_hash": "hash",
+            "sso_complete": True,
+            "user_code_verified": False,
+            "session_data": {
+                "user_id": "user-1",
+                "user_role": LitellmUserRoles.INTERNAL_USER_VIEW_ONLY,
+                "models": [],
+                "teams": ["team-1"],
+                "team_details": [{"team_id": "team-1", "team_alias": "alias"}],
+            },
+        }
+
+        redis_store: dict = {}
+        redis_cache = MagicMock()
+        redis_cache.set_cache.side_effect = lambda key, value, ttl: redis_store.__setitem__(
+            key, str(value).encode("utf-8")
+        )
+        redis_cache.get_cache.side_effect = lambda key: RedisCache._get_cache_logic(
+            MagicMock(), redis_store.get(key)
+        )
+        cache = MagicMock()
+        cache.redis_cache = redis_cache
+
+        _set_cli_sso_flow(login_id=login_id, cache=cache, flow=completed_flow)
+        flow = _get_cli_sso_flow_or_raise(login_id=login_id, cache=cache)
+
+        assert flow["sso_complete"] is True
+        assert flow["session_data"]["user_role"] == LitellmUserRoles.INTERNAL_USER_VIEW_ONLY.value
+        assert flow["session_data"]["team_details"] == [{"team_id": "team-1", "team_alias": "alias"}]
+
     @pytest.mark.asyncio
     async def test_cli_sso_start_creates_bound_flow(self):
         """Test CLI SSO start creates a polling secret bound flow"""
@@ -2151,10 +2238,13 @@ class TestCLIKeyRegenerationFlow:
         mock_request = MagicMock(spec=Request)
         mock_request.client = SimpleNamespace(host="127.0.0.1")
         mock_request.headers = {}
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.increment_cache.return_value = 1
 
-        with patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache):
+        with (
+            patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
+        ):
             result = await cli_sso_start(request=mock_request)
 
         assert result["login_id"].startswith("cli-")
@@ -2182,10 +2272,13 @@ class TestCLIKeyRegenerationFlow:
         mock_request = MagicMock(spec=Request)
         mock_request.client = SimpleNamespace(host="127.0.0.1")
         mock_request.headers = {}
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.increment_cache.return_value = 31
 
-        with patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache):
+        with (
+            patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
+        ):
             with pytest.raises(HTTPException) as exc_info:
                 await cli_sso_start(request=mock_request)
 
@@ -2204,7 +2297,7 @@ class TestCLIKeyRegenerationFlow:
         mock_request.client = SimpleNamespace(host="127.0.0.1")
         mock_request.headers = {}
         mock_request.base_url = "https://proxy.example.com/"
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.increment_cache.return_value = 1
 
         with (
@@ -2238,7 +2331,7 @@ class TestCLIKeyRegenerationFlow:
         mock_request.client = SimpleNamespace(host="127.0.0.1")
         mock_request.headers = {}
         mock_request.base_url = "https://proxy.example.com/"
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.increment_cache.return_value = 1
 
         with (
@@ -2272,7 +2365,7 @@ class TestCLIKeyRegenerationFlow:
 
         mock_request = MagicMock(spec=Request)
         mock_request.base_url = "https://proxy.example.com/"
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {"poll_secret_hash": "h"}
 
         async def drive(enabled: bool):
@@ -2281,6 +2374,7 @@ class TestCLIKeyRegenerationFlow:
                 patch("litellm.proxy.proxy_server.premium_user", True),
                 patch("litellm.proxy.proxy_server.prisma_client", MagicMock()),
                 patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+                patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
                 patch(
                     "litellm.proxy.proxy_server.user_custom_ui_sso_sign_in_handler",
                     None,
@@ -2448,7 +2542,7 @@ class TestCLIKeyRegenerationFlow:
         )
         mock_sso_result = {"user_email": "test@example.com", "user_id": "test-user-123"}
 
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": "poll-secret-hash",
             "user_code_hash": "user-code-hash",
@@ -2467,6 +2561,7 @@ class TestCLIKeyRegenerationFlow:
             ),
             patch("litellm.proxy.proxy_server.prisma_client", MagicMock()),
             patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
         ):
             result = await cli_sso_callback(
                 request=mock_request,
@@ -2491,7 +2586,7 @@ class TestCLIKeyRegenerationFlow:
         mock_request.body = AsyncMock(
             return_value=b"user_code=ABCD-EFGH&browser_complete_token=browser-token"
         )
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": _hash_cli_sso_secret("poll-secret"),
             "user_code_hash": _hash_cli_sso_secret(
@@ -2505,6 +2600,7 @@ class TestCLIKeyRegenerationFlow:
 
         with (
             patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
             patch(
                 "litellm.proxy.common_utils.html_forms.cli_sso_success.render_cli_sso_success_page",
                 return_value="<html>Success</html>",
@@ -2529,7 +2625,7 @@ class TestCLIKeyRegenerationFlow:
 
         mock_request = MagicMock(spec=Request)
         mock_request.body = AsyncMock(return_value=b"user_code=ABCD-EFGH")
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": _hash_cli_sso_secret("poll-secret"),
             "user_code_hash": _hash_cli_sso_secret(
@@ -2541,7 +2637,10 @@ class TestCLIKeyRegenerationFlow:
             "session_data": {"user_id": "test-user-123"},
         }
 
-        with patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache):
+        with (
+            patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
+        ):
             with pytest.raises(HTTPException) as exc_info:
                 await cli_sso_complete(
                     request=mock_request, login_id="cli-session-4567890"
@@ -2563,7 +2662,7 @@ class TestCLIKeyRegenerationFlow:
         mock_request.body = AsyncMock(
             return_value=b"user_code=ABCD-EFGH&browser_complete_token=browser-token"
         )
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": _hash_cli_sso_secret("poll-secret"),
             "user_code_hash": _hash_cli_sso_secret(
@@ -2574,7 +2673,10 @@ class TestCLIKeyRegenerationFlow:
             "session_data": None,
         }
 
-        with patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache):
+        with (
+            patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
+        ):
             with pytest.raises(HTTPException) as exc_info:
                 await cli_sso_complete(
                     request=mock_request, login_id="cli-session-4567890"
@@ -2610,7 +2712,7 @@ class TestCLIKeyRegenerationFlow:
         mock_sso_result = {"user_email": "test@example.com", "user_id": "test-user-123"}
 
         # Mock cache
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": "poll-secret-hash",
             "user_code_hash": "user-code-hash",
@@ -2632,6 +2734,7 @@ class TestCLIKeyRegenerationFlow:
             ),
             patch("litellm.proxy.proxy_server.prisma_client", MagicMock()),
             patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
             patch(
                 "litellm.proxy.common_utils.html_forms.cli_sso_success.render_cli_sso_success_page",
                 return_value="<html>Success</html>",
@@ -2692,7 +2795,7 @@ class TestCLIKeyRegenerationFlow:
         }
 
         # Mock cache
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": _hash_cli_sso_secret("poll-secret"),
             "sso_complete": True,
@@ -2700,7 +2803,10 @@ class TestCLIKeyRegenerationFlow:
             "session_data": session_data,
         }
 
-        with patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache):
+        with (
+            patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
+        ):
             # Act - First poll without team_id
             result = await cli_poll_key(
                 key_id=session_key,
@@ -2726,7 +2832,7 @@ class TestCLIKeyRegenerationFlow:
             cli_poll_key,
         )
 
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": _hash_cli_sso_secret("poll-secret"),
             "sso_complete": True,
@@ -2739,7 +2845,10 @@ class TestCLIKeyRegenerationFlow:
             },
         }
 
-        with patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache):
+        with (
+            patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
+        ):
             with pytest.raises(HTTPException) as exc_info:
                 await cli_poll_key(key_id="cli-session-789123", team_id=None)
 
@@ -2753,7 +2862,7 @@ class TestCLIKeyRegenerationFlow:
             cli_poll_key,
         )
 
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": _hash_cli_sso_secret("poll-secret"),
             "sso_complete": True,
@@ -2766,7 +2875,10 @@ class TestCLIKeyRegenerationFlow:
             },
         }
 
-        with patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache):
+        with (
+            patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
+        ):
             result = await cli_poll_key(
                 key_id="cli-session-789123",
                 team_id=None,
@@ -2932,7 +3044,7 @@ class TestCLIKeyRegenerationFlow:
         )
 
         # Mock cache
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": _hash_cli_sso_secret("poll-secret"),
             "sso_complete": True,
@@ -2944,6 +3056,7 @@ class TestCLIKeyRegenerationFlow:
 
         with (
             patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
             patch("litellm.proxy.proxy_server.prisma_client"),
             patch(
                 "litellm.proxy.auth.auth_checks.ExperimentalUIJWTToken.get_cli_jwt_auth_token",
@@ -3007,7 +3120,7 @@ class TestCLIKeyRegenerationFlow:
             models=["gpt-4"],
             max_budget=100.0,
         )
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": _hash_cli_sso_secret("poll-secret"),
             "sso_complete": True,
@@ -3018,6 +3131,7 @@ class TestCLIKeyRegenerationFlow:
 
         with (
             patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
             patch("litellm.proxy.proxy_server.prisma_client"),
             patch(
                 "litellm.proxy.auth.auth_checks.ExperimentalUIJWTToken.get_cli_jwt_auth_token",
@@ -3069,7 +3183,7 @@ class TestCLIKeyRegenerationFlow:
             max_budget=None,
         )
         mock_team = LiteLLM_TeamTableCachedObj(team_id="team-x", max_budget=None)
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": _hash_cli_sso_secret("poll-secret"),
             "sso_complete": True,
@@ -3080,6 +3194,7 @@ class TestCLIKeyRegenerationFlow:
 
         with (
             patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
             patch("litellm.proxy.proxy_server.prisma_client"),
             patch(
                 "litellm.proxy.auth.auth_checks.ExperimentalUIJWTToken.get_cli_jwt_auth_token",
@@ -4020,7 +4135,7 @@ class TestPKCEFunctionality:
         mock_request.query_params = {"state": test_state}
 
         # Mock cache with async methods — use dict format (primary path)
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         test_code_verifier = "test_code_verifier_abc123xyz"
         mock_cache.async_get_cache = AsyncMock(
             return_value={"code_verifier": test_code_verifier}
@@ -4071,7 +4186,7 @@ class TestPKCEFunctionality:
         mock_sso.__exit__ = MagicMock(return_value=False)
 
         test_state = "test456"
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
 
         mock_cache.async_set_cache = AsyncMock()
 
@@ -4595,7 +4710,7 @@ class TestPKCEFunctionality:
         from litellm.proxy._types import ProxyException
         from litellm.proxy.management_endpoints.ui_sso import SSOAuthenticationHandler
 
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.async_get_cache = AsyncMock(return_value=None)  # verifier not found
 
         mock_request = MagicMock(spec=Request)
@@ -4721,7 +4836,7 @@ class TestPKCEFunctionality:
         from litellm.proxy.management_endpoints.ui_sso import SSOAuthenticationHandler
 
         # Cache returns an integer — unexpected format
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.async_get_cache = AsyncMock(return_value=12345)
         mock_cache.async_delete_cache = AsyncMock()
 
@@ -4763,7 +4878,7 @@ class TestPKCEFunctionality:
 
         from litellm.proxy.management_endpoints.ui_sso import SSOAuthenticationHandler
 
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.async_get_cache = AsyncMock(return_value=None)  # verifier not found
 
         mock_request = MagicMock(spec=Request)
@@ -4851,7 +4966,7 @@ class TestPKCEFunctionality:
         from litellm.proxy.management_endpoints.ui_sso import SSOAuthenticationHandler
 
         # Cache returns an integer — unexpected format
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.async_get_cache = AsyncMock(return_value=12345)
         mock_cache.async_delete_cache = AsyncMock()
 
@@ -4903,7 +5018,7 @@ class TestPKCEFunctionality:
         from litellm.proxy.management_endpoints.ui_sso import SSOAuthenticationHandler
 
         legacy_verifier = "legacy_plain_string_verifier_abc123"
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.async_get_cache = AsyncMock(return_value=legacy_verifier)
 
         mock_request = MagicMock(spec=Request)
@@ -6187,7 +6302,7 @@ class TestCliSsoAttributionMetadata:
             provider="generic",
             team_ids=[],
         )
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": "poll-secret-hash",
             "user_code_hash": "user-code-hash",
@@ -6204,6 +6319,7 @@ class TestCliSsoAttributionMetadata:
             ),
             patch("litellm.proxy.proxy_server.prisma_client", MagicMock()),
             patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
             patch("litellm.proxy.proxy_server.user_custom_sso", None),
         ):
             await ui_sso.cli_sso_callback(
@@ -6228,7 +6344,7 @@ class TestCliSsoAttributionMetadata:
 
         mock_request = MagicMock(spec=Request)
         mock_request.base_url = "http://internal-proxy.local/"
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": "poll-secret-hash",
             "user_code_hash": "user-code-hash",
@@ -6251,6 +6367,7 @@ class TestCliSsoAttributionMetadata:
             ) as get_user_info_mock,
             patch("litellm.proxy.proxy_server.prisma_client", MagicMock()),
             patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
             patch("litellm.proxy.proxy_server.user_custom_sso", None),
             patch(
                 "litellm.proxy.proxy_server.general_settings",
@@ -6297,7 +6414,7 @@ class TestCliSsoAttributionMetadata:
             "user_id": "test-user-123",
             "employment_type": "contractor",
         }
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": "poll-secret-hash",
             "user_code_hash": "user-code-hash",
@@ -6325,6 +6442,7 @@ class TestCliSsoAttributionMetadata:
             ),
             patch("litellm.proxy.proxy_server.prisma_client", mock_prisma),
             patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
             patch("litellm.proxy.proxy_server.user_custom_sso", None),
             patch(
                 "litellm.proxy.common_utils.html_forms.cli_sso_success.render_cli_sso_success_page",
@@ -6366,7 +6484,7 @@ class TestCliSsoAttributionMetadata:
                 "org": {"cost_center": "CC-42"},
             },
         }
-        mock_cache = MagicMock()
+        mock_cache = MagicMock(redis_cache=None)
         mock_cache.get_cache.return_value = {
             "poll_secret_hash": _hash_cli_sso_secret("poll-secret"),
             "sso_complete": True,
@@ -6374,7 +6492,10 @@ class TestCliSsoAttributionMetadata:
             "session_data": session_data,
         }
 
-        with patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache):
+        with (
+            patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+            patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
+        ):
             result = await cli_poll_key(
                 key_id=session_key,
                 team_id=None,
@@ -7225,7 +7346,7 @@ async def test_cli_poll_key_tolerates_missing_user_row():
         "models": ["gpt-4"],
     }
 
-    mock_cache = MagicMock()
+    mock_cache = MagicMock(redis_cache=None)
     mock_cache.get_cache.return_value = {
         "poll_secret_hash": _hash_cli_sso_secret("poll-secret"),
         "sso_complete": True,
@@ -7237,6 +7358,7 @@ async def test_cli_poll_key_tolerates_missing_user_row():
 
     with (
         patch("litellm.proxy.proxy_server.user_api_key_cache", mock_cache),
+        patch("litellm.proxy.proxy_server.cli_sso_session_cache", mock_cache),
         patch("litellm.proxy.proxy_server.prisma_client"),
         patch(
             "litellm.proxy.auth.auth_checks.ExperimentalUIJWTToken.get_cli_jwt_auth_token",
diff --git a/tests/test_litellm/proxy/test_redis_auth_cache_flag.py b/tests/test_litellm/proxy/test_redis_auth_cache_flag.py
index d0cb5ec5465..878d9d577c8 100644
--- a/tests/test_litellm/proxy/test_redis_auth_cache_flag.py
+++ b/tests/test_litellm/proxy/test_redis_auth_cache_flag.py
@@ -54,8 +54,14 @@ def _patched_init_cache(litellm_settings: dict, cache_params: dict):
        _FakeRedisCache (passes the isinstance guard in _init_cache).
     3. Extracts enable_redis_auth_cache from litellm_settings and passes it
        as the second argument to _init_cache (matching production behaviour).
-    4. Yields (user_api_key_cache, spend_counter_cache) after calling
-       _init_cache, then restores everything.
+    4. Yields (user_api_key_cache, spend_counter_cache, cli_sso_session_cache)
+       after calling _init_cache, then restores everything.
+
+    _init_cache also writes three globals this helper does not patch:
+    ``litellm.cache``, ``ps.redis_usage_cache`` and
+    ``litellm_config_cache.redis_cache``. They are saved and restored here so a
+    _FakeRedisCache never outlives this context and poisons later test files in
+    the same pytest session.
     """
     fake_redis = _FakeRedisCache()
 
@@ -64,19 +70,30 @@ def _patched_init_cache(litellm_settings: dict, cache_params: dict):
 
     fresh_user_cache = DualCache()
     fresh_spend_cache = DualCache()
+    fresh_cli_sso_cache = DualCache()
 
     enable_redis_auth_cache = litellm_settings.get("enable_redis_auth_cache", False)
 
+    prev_litellm_cache = litellm.cache
+    prev_redis_usage_cache = ps.redis_usage_cache
+    prev_config_cache_redis = ps.litellm_config_cache.redis_cache
+
     with (
         patch.object(ps, "user_api_key_cache", fresh_user_cache),
         patch.object(ps, "spend_counter_cache", fresh_spend_cache),
+        patch.object(ps, "cli_sso_session_cache", fresh_cli_sso_cache),
         patch.object(ps, "llm_router", None),
         # Cache is locally imported inside _init_cache: patch it at source.
         patch("litellm.Cache", return_value=mock_litellm_cache),
     ):
         litellm.cache = None
-        ps.ProxyConfig()._init_cache(cache_params, enable_redis_auth_cache)
-        yield fresh_user_cache, fresh_spend_cache
+        try:
+            ps.ProxyConfig()._init_cache(cache_params, enable_redis_auth_cache)
+            yield fresh_user_cache, fresh_spend_cache, fresh_cli_sso_cache
+        finally:
+            litellm.cache = prev_litellm_cache
+            ps.redis_usage_cache = prev_redis_usage_cache
+            ps.litellm_config_cache.redis_cache = prev_config_cache_redis
 
 
 # ---------------------------------------------------------------------------
@@ -90,7 +107,7 @@ class TestRedisAuthCacheFlag:
         with _patched_init_cache(
             litellm_settings={"enable_redis_auth_cache": True},
             cache_params={"type": "redis", "host": "localhost", "port": 6379},
-        ) as (user_cache, _):
+        ) as (user_cache, _, _cli_sso_cache):
             assert user_cache.redis_cache is not None, (
                 "Redis should be attached to user_api_key_cache when "
                 "enable_redis_auth_cache=True"
@@ -101,7 +118,7 @@ class TestRedisAuthCacheFlag:
         with _patched_init_cache(
             litellm_settings={"enable_redis_auth_cache": False},
             cache_params={"type": "redis", "host": "localhost", "port": 6379},
-        ) as (user_cache, _):
+        ) as (user_cache, _, _cli_sso_cache):
             assert user_cache.redis_cache is None, (
                 "user_api_key_cache must remain in-memory-only when "
                 "enable_redis_auth_cache=False"
@@ -112,7 +129,7 @@ class TestRedisAuthCacheFlag:
         with _patched_init_cache(
             litellm_settings={},
             cache_params={"type": "redis", "host": "localhost", "port": 6379},
-        ) as (user_cache, _):
+        ) as (user_cache, _, _cli_sso_cache):
             assert user_cache.redis_cache is None, (
                 "user_api_key_cache must remain in-memory-only when "
                 "enable_redis_auth_cache is absent from litellm_settings"
@@ -129,7 +146,7 @@ class TestRedisAuthCacheFlag:
             with _patched_init_cache(
                 litellm_settings=ls,
                 cache_params={"type": "redis", "host": "localhost", "port": 6379},
-            ) as (_, spend_cache):
+            ) as (_, spend_cache, _cli_sso_cache):
                 assert spend_cache.redis_cache is not None, (
                     f"spend_counter_cache must always get Redis "
                     f"(enable_redis_auth_cache={flag_value!r})"
@@ -140,6 +157,28 @@ class TestRedisAuthCacheFlag:
         with _patched_init_cache(
             litellm_settings={"enable_redis_auth_cache": False},
             cache_params={"type": "redis", "host": "localhost", "port": 6379},
-        ) as (user_cache, spend_cache):
+        ) as (user_cache, spend_cache, _cli_sso_cache):
             assert spend_cache.redis_cache is not None
             assert user_cache.redis_cache is None
+
+    def test_cli_sso_session_cache_always_gets_redis_regardless_of_flag(self):
+        """
+        cli_sso_session_cache must receive Redis regardless of the auth-cache
+        flag so that `lite login` works on multi-worker deployments without
+        enable_redis_auth_cache (regression for the CLI SSO "Invalid CLI login
+        session" bug)
+        """
+        for flag_value in (True, False, None):
+            ls = (
+                {"enable_redis_auth_cache": flag_value}
+                if flag_value is not None
+                else {}
+            )
+            with _patched_init_cache(
+                litellm_settings=ls,
+                cache_params={"type": "redis", "host": "localhost", "port": 6379},
+            ) as (_, _, cli_sso_cache):
+                assert cli_sso_cache.redis_cache is not None, (
+                    f"cli_sso_session_cache must always get Redis "
+                    f"(enable_redis_auth_cache={flag_value!r})"
+                )