diff --git a/litellm/proxy/management_endpoints/management_v1/common.py b/litellm/proxy/management_endpoints/management_v1/common.py
index c0e7f49f2e9..caa34d75f3d 100644
--- a/litellm/proxy/management_endpoints/management_v1/common.py
+++ b/litellm/proxy/management_endpoints/management_v1/common.py
@@ -3,7 +3,7 @@
 from urllib.parse import urlencode
 
 from fastapi import Request
-from fastapi.dependencies.utils import get_flat_dependant
+from fastapi.dependencies.models import Dependant
 from fastapi.responses import JSONResponse
 
 from litellm.types.proxy.management_endpoints.management_v1 import (
@@ -35,12 +35,19 @@ def problem_response(problem: ProblemDetail) -> JSONResponse:
     )
 
 
+def _flat_query_params(dependant: Dependant) -> tuple[str, ...]:
+    return (
+        *(field.alias for field in dependant.query_params),
+        *(alias for dependency in dependant.dependencies for alias in _flat_query_params(dependency)),
+    )
+
+
 def _declared_query_params(request: Request) -> frozenset[str]:
     route = request.scope.get("route")
     dependant = getattr(route, "dependant", None)
-    if dependant is None:
+    if not isinstance(dependant, Dependant):
         return frozenset()
-    return frozenset(field.alias for field in get_flat_dependant(dependant, skip_repeats=True).query_params)
+    return frozenset(_flat_query_params(dependant))
 
 
 async def reject_unknown_query_params(request: Request) -> None:
diff --git a/tests/test_litellm/proxy/management_endpoints/management_v1/test_common.py b/tests/test_litellm/proxy/management_endpoints/management_v1/test_common.py
new file mode 100644
index 00000000000..1933cdf77fb
--- /dev/null
+++ b/tests/test_litellm/proxy/management_endpoints/management_v1/test_common.py
@@ -0,0 +1,45 @@
+from typing import Optional
+
+from fastapi import Depends, FastAPI, Query, Request
+from fastapi.testclient import TestClient
+
+from litellm.proxy.management_endpoints.management_v1.common import (
+    ManagementProblem,
+    problem_response,
+    reject_unknown_query_params,
+)
+
+
+def _team_scope(team_id: Optional[str] = Query(default=None)) -> Optional[str]:
+    return team_id
+
+
+app = FastAPI()
+
+
+@app.exception_handler(ManagementProblem)
+async def _handle(request: Request, exc: ManagementProblem):
+    return problem_response(exc.problem)
+
+
+@app.get("/things", dependencies=[Depends(reject_unknown_query_params)])
+def _things(page: int = Query(default=1), _scope: Optional[str] = Depends(_team_scope)) -> dict:
+    return {"ok": True}
+
+
+client = TestClient(app)
+
+
+def test_accepts_query_params_declared_on_the_route_and_nested_dependencies():
+    """`team_id` is declared on a nested dependency, not the route signature, so a
+    shallow scan of the route's own params would wrongly reject it."""
+    assert client.get("/things?page=2&team_id=t1").status_code == 200
+
+
+def test_rejects_unknown_param_and_reports_nested_declared_params_as_allowed():
+    response = client.get("/things?bogus=1")
+
+    assert response.status_code == 400
+    body = response.json()
+    assert "bogus" in body["detail"]
+    assert {"page", "team_id"}.issubset(set(body["allowed"]))