diff --git a/airflow-core/src/airflow/api_fastapi/app.py b/airflow-core/src/airflow/api_fastapi/app.py
index 63acab3b21473..5168013379905 100644
--- a/airflow-core/src/airflow/api_fastapi/app.py
+++ b/airflow-core/src/airflow/api_fastapi/app.py
@@ -18,12 +18,13 @@
 
 import logging
 from contextlib import AsyncExitStack, asynccontextmanager
-from typing import TYPE_CHECKING, cast
+from typing import cast
 from urllib.parse import urlsplit
 
 from fastapi import FastAPI
 from starlette.routing import Mount
 
+from airflow.api_fastapi.common.auth_manager import init_auth_manager
 from airflow.api_fastapi.common.dagbag import create_dag_bag
 from airflow.api_fastapi.core_api.app import (
     init_config,
@@ -34,12 +35,8 @@
 )
 from airflow.api_fastapi.execution_api.app import create_task_execution_api_app
 from airflow.configuration import conf
-from airflow.exceptions import AirflowConfigException
 from airflow.utils.providers_configuration_loader import providers_configuration_loaded
 
-if TYPE_CHECKING:
-    from airflow.api_fastapi.auth.managers.base_auth_manager import BaseAuthManager
-
 API_BASE_URL = conf.get("api", "base_url", fallback="")
 if not API_BASE_URL or not API_BASE_URL.endswith("/"):
     API_BASE_URL += "/"
@@ -51,7 +48,6 @@
 log = logging.getLogger(__name__)
 
 app: FastAPI | None = None
-auth_manager: BaseAuthManager | None = None
 
 
 @asynccontextmanager
@@ -111,59 +107,9 @@ def cached_app(config=None, testing=False, apps="all") -> FastAPI:
 
 
 def purge_cached_app() -> None:
-    """Remove the cached version of the app and auth_manager in global state."""
-    global app, auth_manager
+    """Remove the cached version of the app in global state."""
+    global app
     app = None
-    auth_manager = None
-
-
-def get_auth_manager_cls() -> type[BaseAuthManager]:
-    """
-    Return just the auth manager class without initializing it.
-
-    Useful to save execution time if only static methods need to be called.
-    """
-    auth_manager_cls = conf.getimport(section="core", key="auth_manager")
-
-    if not auth_manager_cls:
-        raise AirflowConfigException(
-            "No auth manager defined in the config. Please specify one using section/key [core/auth_manager]."
-        )
-
-    return auth_manager_cls
-
-
-def create_auth_manager() -> BaseAuthManager:
-    """Create the auth manager."""
-    global auth_manager
-    auth_manager_cls = get_auth_manager_cls()
-    auth_manager = auth_manager_cls()
-    return auth_manager
-
-
-def init_auth_manager(app: FastAPI | None = None) -> BaseAuthManager:
-    """Initialize the auth manager."""
-    am = create_auth_manager()
-    am.init()
-    if app:
-        app.state.auth_manager = am
-
-    if app and (auth_manager_fastapi_app := am.get_fastapi_app()):
-        app.mount("/auth", auth_manager_fastapi_app)
-
-    return am
-
-
-def get_auth_manager() -> BaseAuthManager:
-    """Return the auth manager, provided it's been initialized before."""
-    global auth_manager
-
-    if auth_manager is None:
-        raise RuntimeError(
-            "Auth Manager has not been initialized yet. "
-            "The `init_auth_manager` method needs to be called first."
-        )
-    return auth_manager
 
 
 def init_plugins(app: FastAPI) -> None:
diff --git a/airflow-core/src/airflow/api_fastapi/auth/managers/simple/services/login.py b/airflow-core/src/airflow/api_fastapi/auth/managers/simple/services/login.py
index d4e606ebfc3e0..ac50fe6c967b6 100644
--- a/airflow-core/src/airflow/api_fastapi/auth/managers/simple/services/login.py
+++ b/airflow-core/src/airflow/api_fastapi/auth/managers/simple/services/login.py
@@ -19,10 +19,10 @@
 
 from fastapi import HTTPException, status
 
-from airflow.api_fastapi.app import get_auth_manager
 from airflow.api_fastapi.auth.managers.simple.datamodels.login import LoginBody
 from airflow.api_fastapi.auth.managers.simple.simple_auth_manager import SimpleAuthManager
 from airflow.api_fastapi.auth.managers.simple.user import SimpleAuthManagerUser
+from airflow.api_fastapi.common.auth_manager import AuthManagerDep
 from airflow.configuration import conf
 
 
@@ -31,7 +31,9 @@ class SimpleAuthManagerLogin:
 
     @staticmethod
     def create_token(
-        body: LoginBody, expiration_time_in_seconds: int = conf.getint("api_auth", "jwt_expiration_time")
+        auth_manager: AuthManagerDep,
+        body: LoginBody,
+        expiration_time_in_seconds: int = conf.getint("api_auth", "jwt_expiration_time"),
     ) -> str:
         """
         Authenticate user with given configuration.
@@ -70,9 +72,7 @@ def create_token(
             role=found_users[0]["role"],
         )
 
-        return get_auth_manager().generate_jwt(
-            user=user, expiration_time_in_seconds=expiration_time_in_seconds
-        )
+        return auth_manager.generate_jwt(user=user, expiration_time_in_seconds=expiration_time_in_seconds)
 
     @staticmethod
     def create_token_all_admins(
@@ -91,12 +91,11 @@ def create_token_all_admins(
 
     @staticmethod
     def _create_anonymous_admin_user(
+        auth_manager: AuthManagerDep,
         expiration_time_in_seconds: int = conf.getint("api_auth", "jwt_expiration_time"),
     ) -> str:
         user = SimpleAuthManagerUser(
             username="Anonymous",
             role="ADMIN",
         )
-        return get_auth_manager().generate_jwt(
-            user=user, expiration_time_in_seconds=expiration_time_in_seconds
-        )
+        return auth_manager.generate_jwt(user=user, expiration_time_in_seconds=expiration_time_in_seconds)
diff --git a/airflow-core/src/airflow/api_fastapi/common/auth_manager.py b/airflow-core/src/airflow/api_fastapi/common/auth_manager.py
new file mode 100644
index 0000000000000..d63a9e0a68253
--- /dev/null
+++ b/airflow-core/src/airflow/api_fastapi/common/auth_manager.py
@@ -0,0 +1,93 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Annotated
+
+from fastapi import Depends, Request
+
+from airflow.api_fastapi.auth.managers.base_auth_manager import BaseAuthManager
+from airflow.configuration import conf
+from airflow.exceptions import AirflowConfigException
+
+if TYPE_CHECKING:
+    from fastapi import FastAPI
+
+auth_manager: BaseAuthManager | None = None
+
+
+def get_auth_manager_cls() -> type[BaseAuthManager]:
+    """
+    Return just the auth manager class without initializing it.
+
+    Useful to save execution time if only static methods need to be called.
+    """
+    auth_manager_cls = conf.getimport(section="core", key="auth_manager")
+
+    if not auth_manager_cls:
+        raise AirflowConfigException(
+            "No auth manager defined in the config. Please specify one using section/key [core/auth_manager]."
+        )
+
+    return auth_manager_cls
+
+
+def create_auth_manager() -> BaseAuthManager:
+    """Create the auth manager."""
+    global auth_manager
+
+    auth_manager_cls = get_auth_manager_cls()
+    auth_manager = auth_manager_cls()
+    return auth_manager
+
+
+def get_auth_manager() -> BaseAuthManager:
+    """Return the auth manager, provided it's been initialized before."""
+    global auth_manager
+
+    if auth_manager is None:
+        raise RuntimeError(
+            "Auth Manager has not been initialized yet. "
+            "The `init_auth_manager` method needs to be called first."
+        )
+    return auth_manager
+
+
+def init_auth_manager(app: FastAPI | None = None) -> BaseAuthManager:
+    """Initialize the auth manager for the FastAPI app."""
+    am = create_auth_manager()
+    am.init()
+    if app:
+        app.state.auth_manager = am
+
+    if app and (auth_manager_fastapi_app := am.get_fastapi_app()):
+        app.mount("/auth", auth_manager_fastapi_app)
+
+    return am
+
+
+def dag_auth_manager_from_app(request: Request) -> BaseAuthManager:
+    """
+    FastAPI dependency resolver that returns the shared auth manager instance from app.state.
+
+    This ensures that all API routes using auth manager via dependency injection receive the same
+    singleton instance that was initialized at app startup.
+    """
+    return request.app.state.auth_manager
+
+
+AuthManagerDep = Annotated[BaseAuthManager, Depends(dag_auth_manager_from_app)]
diff --git a/airflow-core/src/airflow/api_fastapi/core_api/routes/public/import_error.py b/airflow-core/src/airflow/api_fastapi/core_api/routes/public/import_error.py
index 4beb0ea2cd416..e71aab2bc827d 100644
--- a/airflow-core/src/airflow/api_fastapi/core_api/routes/public/import_error.py
+++ b/airflow-core/src/airflow/api_fastapi/core_api/routes/public/import_error.py
@@ -24,11 +24,11 @@
 from fastapi import Depends, HTTPException, status
 from sqlalchemy import select
 
-from airflow.api_fastapi.app import get_auth_manager
 from airflow.api_fastapi.auth.managers.models.batch_apis import IsAuthorizedDagRequest
 from airflow.api_fastapi.auth.managers.models.resource_details import (
     DagDetails,
 )
+from airflow.api_fastapi.common.auth_manager import AuthManagerDep
 from airflow.api_fastapi.common.db.common import (
     SessionDep,
     paginated_select,
@@ -67,6 +67,7 @@ def get_import_error(
     import_error_id: int,
     session: SessionDep,
     user: GetUserDep,
+    auth_manager: AuthManagerDep,
 ) -> ImportErrorResponse:
     """Get an import error."""
     error = session.scalar(select(ParseImportError).where(ParseImportError.id == import_error_id))
@@ -77,7 +78,6 @@ def get_import_error(
         )
     session.expunge(error)
 
-    auth_manager = get_auth_manager()
     can_read_all_dags = auth_manager.is_authorized_dag(method="GET", user=user)
     if can_read_all_dags:
         # Early return if the user has access to all DAGs
@@ -128,6 +128,7 @@ def get_import_errors(
     ],
     session: SessionDep,
     user: GetUserDep,
+    auth_manager: AuthManagerDep,
 ) -> ImportErrorCollectionResponse:
     """Get all import errors."""
     import_errors_select, total_entries = paginated_select(
@@ -138,7 +139,6 @@ def get_import_errors(
         session=session,
     )
 
-    auth_manager = get_auth_manager()
     can_read_all_dags = auth_manager.is_authorized_dag(method="GET", user=user)
     if can_read_all_dags:
         # Early return if the user has access to all DAGs
diff --git a/airflow-core/src/airflow/api_fastapi/core_api/routes/ui/auth.py b/airflow-core/src/airflow/api_fastapi/core_api/routes/ui/auth.py
index f3c20a9ccef39..854389d70a872 100644
--- a/airflow-core/src/airflow/api_fastapi/core_api/routes/ui/auth.py
+++ b/airflow-core/src/airflow/api_fastapi/core_api/routes/ui/auth.py
@@ -17,7 +17,7 @@
 
 from __future__ import annotations
 
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import AuthManagerDep
 from airflow.api_fastapi.common.router import AirflowRouter
 from airflow.api_fastapi.core_api.datamodels.ui.auth import (
     MenuItemCollectionResponse,
@@ -29,10 +29,11 @@
 
 @auth_router.get("/auth/menus")
 def get_auth_menus(
+    auth_manager: AuthManagerDep,
     user: GetUserDep,
 ) -> MenuItemCollectionResponse:
-    authorized_menu_items = get_auth_manager().get_authorized_menu_items(user=user)
-    extra_menu_items = get_auth_manager().get_extra_menu_items(user=user)
+    authorized_menu_items = auth_manager.get_authorized_menu_items(user=user)
+    extra_menu_items = auth_manager.get_extra_menu_items(user=user)
 
     return MenuItemCollectionResponse(
         authorized_menu_items=authorized_menu_items,
diff --git a/airflow-core/src/airflow/api_fastapi/core_api/security.py b/airflow-core/src/airflow/api_fastapi/core_api/security.py
index adc6cf2e01433..c1cde4b93817a 100644
--- a/airflow-core/src/airflow/api_fastapi/core_api/security.py
+++ b/airflow-core/src/airflow/api_fastapi/core_api/security.py
@@ -25,7 +25,6 @@
 from jwt import ExpiredSignatureError, InvalidTokenError
 from pydantic import NonNegativeInt
 
-from airflow.api_fastapi.app import get_auth_manager
 from airflow.api_fastapi.auth.managers.models.base_user import BaseUser
 from airflow.api_fastapi.auth.managers.models.resource_details import (
     AccessView,
@@ -39,6 +38,7 @@
     PoolDetails,
     VariableDetails,
 )
+from airflow.api_fastapi.common.auth_manager import AuthManagerDep
 from airflow.api_fastapi.core_api.base import OrmClause
 from airflow.configuration import conf
 from airflow.models.dag import DagModel, DagRun, DagTag
@@ -49,7 +49,7 @@
 if TYPE_CHECKING:
     from sqlalchemy.sql import Select
 
-    from airflow.api_fastapi.auth.managers.base_auth_manager import BaseAuthManager, ResourceMethod
+    from airflow.api_fastapi.auth.managers.base_auth_manager import ResourceMethod
 
 auth_description = (
     "To authenticate Airflow API requests, clients must include a JWT (JSON Web Token) in "
@@ -64,9 +64,12 @@
 oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/auth/token", description=auth_description)
 
 
-async def get_user(token_str: Annotated[str, Depends(oauth2_scheme)]) -> BaseUser:
+async def get_user(
+    auth_manager: AuthManagerDep,
+    token_str: Annotated[str, Depends(oauth2_scheme)],
+) -> BaseUser:
     try:
-        return await get_auth_manager().get_user_from_token(token_str)
+        return await auth_manager.get_user_from_token(token_str)
     except ExpiredSignatureError:
         raise HTTPException(status.HTTP_401_UNAUTHORIZED, "Token Expired")
     except InvalidTokenError:
@@ -98,12 +101,13 @@ def requires_access_dag(
 ) -> Callable[[Request, BaseUser], None]:
     def inner(
         request: Request,
+        auth_manager: AuthManagerDep,
         user: GetUserDep,
     ) -> None:
         dag_id: str | None = request.path_params.get("dag_id")
 
         _requires_access(
-            is_authorized_callback=lambda: get_auth_manager().is_authorized_dag(
+            is_authorized_callback=lambda: auth_manager.is_authorized_dag(
                 method=method, access_entity=access_entity, details=DagDetails(id=dag_id), user=user
             )
         )
@@ -164,10 +168,9 @@ def permitted_dag_filter_factory(
     """
 
     def depends_permitted_dags_filter(
-        request: Request,
+        auth_manager: AuthManagerDep,
         user: GetUserDep,
     ) -> PermittedDagFilter:
-        auth_manager: BaseAuthManager = request.app.state.auth_manager
         authorized_dags: set[str] = auth_manager.get_authorized_dag_ids(user=user, method=method)
         return filter_class(authorized_dags)
 
@@ -197,12 +200,13 @@ def depends_permitted_dags_filter(
 def requires_access_backfill(method: ResourceMethod) -> Callable:
     def inner(
         request: Request,
-        user: Annotated[BaseUser | None, Depends(get_user)] = None,
+        auth_manager: AuthManagerDep,
+        user: GetUserDep,
     ) -> None:
         backfill_id: NonNegativeInt | None = request.path_params.get("backfill_id")
 
         _requires_access(
-            is_authorized_callback=lambda: get_auth_manager().is_authorized_backfill(
+            is_authorized_callback=lambda: auth_manager.is_authorized_backfill(
                 method=method, details=BackfillDetails(id=backfill_id), user=user
             ),
         )
@@ -213,12 +217,13 @@ def inner(
 def requires_access_pool(method: ResourceMethod) -> Callable[[Request, BaseUser], None]:
     def inner(
         request: Request,
+        auth_manager: AuthManagerDep,
         user: GetUserDep,
     ) -> None:
         pool_name = request.path_params.get("pool_name")
 
         _requires_access(
-            is_authorized_callback=lambda: get_auth_manager().is_authorized_pool(
+            is_authorized_callback=lambda: auth_manager.is_authorized_pool(
                 method=method, details=PoolDetails(name=pool_name), user=user
             )
         )
@@ -229,12 +234,13 @@ def inner(
 def requires_access_connection(method: ResourceMethod) -> Callable[[Request, BaseUser], None]:
     def inner(
         request: Request,
+        auth_manager: AuthManagerDep,
         user: GetUserDep,
     ) -> None:
         connection_id = request.path_params.get("connection_id")
 
         _requires_access(
-            is_authorized_callback=lambda: get_auth_manager().is_authorized_connection(
+            is_authorized_callback=lambda: auth_manager.is_authorized_connection(
                 method=method, details=ConnectionDetails(conn_id=connection_id), user=user
             )
         )
@@ -245,12 +251,13 @@ def inner(
 def requires_access_configuration(method: ResourceMethod) -> Callable[[Request, BaseUser | None], None]:
     def inner(
         request: Request,
-        user: Annotated[BaseUser | None, Depends(get_user)] = None,
+        auth_manager: AuthManagerDep,
+        user: GetUserDep,
     ) -> None:
         section: str | None = request.query_params.get("section") or request.path_params.get("section")
 
         _requires_access(
-            is_authorized_callback=lambda: get_auth_manager().is_authorized_configuration(
+            is_authorized_callback=lambda: auth_manager.is_authorized_configuration(
                 method=method,
                 details=ConfigurationDetails(section=section),
                 user=user,
@@ -263,12 +270,13 @@ def inner(
 def requires_access_variable(method: ResourceMethod) -> Callable[[Request, BaseUser | None], None]:
     def inner(
         request: Request,
-        user: Annotated[BaseUser | None, Depends(get_user)] = None,
+        auth_manager: AuthManagerDep,
+        user: GetUserDep,
     ) -> None:
         variable_key: str | None = request.path_params.get("variable_key")
 
         _requires_access(
-            is_authorized_callback=lambda: get_auth_manager().is_authorized_variable(
+            is_authorized_callback=lambda: auth_manager.is_authorized_variable(
                 method=method, details=VariableDetails(key=variable_key), user=user
             ),
         )
@@ -279,12 +287,13 @@ def inner(
 def requires_access_asset(method: ResourceMethod) -> Callable:
     def inner(
         request: Request,
-        user: Annotated[BaseUser | None, Depends(get_user)] = None,
+        auth_manager: AuthManagerDep,
+        user: GetUserDep,
     ) -> None:
         asset_id = request.path_params.get("asset_id")
 
         _requires_access(
-            is_authorized_callback=lambda: get_auth_manager().is_authorized_asset(
+            is_authorized_callback=lambda: auth_manager.is_authorized_asset(
                 method=method, details=AssetDetails(id=asset_id), user=user
             ),
         )
@@ -294,11 +303,11 @@ def inner(
 
 def requires_access_view(access_view: AccessView) -> Callable[[Request, BaseUser | None], None]:
     def inner(
-        request: Request,
-        user: Annotated[BaseUser | None, Depends(get_user)] = None,
+        auth_manager: AuthManagerDep,
+        user: GetUserDep,
     ) -> None:
         _requires_access(
-            is_authorized_callback=lambda: get_auth_manager().is_authorized_view(
+            is_authorized_callback=lambda: auth_manager.is_authorized_view(
                 access_view=access_view, user=user
             ),
         )
@@ -309,12 +318,13 @@ def inner(
 def requires_access_asset_alias(method: ResourceMethod) -> Callable:
     def inner(
         request: Request,
-        user: Annotated[BaseUser | None, Depends(get_user)] = None,
+        auth_manager: AuthManagerDep,
+        user: GetUserDep,
     ) -> None:
         asset_alias_id: str | None = request.path_params.get("asset_alias_id")
 
         _requires_access(
-            is_authorized_callback=lambda: get_auth_manager().is_authorized_asset_alias(
+            is_authorized_callback=lambda: auth_manager.is_authorized_asset_alias(
                 method=method, details=AssetAliasDetails(id=asset_alias_id), user=user
             ),
         )
diff --git a/airflow-core/src/airflow/cli/cli_parser.py b/airflow-core/src/airflow/cli/cli_parser.py
index a11f6f8aab365..b136e33679dc4 100644
--- a/airflow-core/src/airflow/cli/cli_parser.py
+++ b/airflow-core/src/airflow/cli/cli_parser.py
@@ -36,7 +36,7 @@
 import lazy_object_proxy
 from rich_argparse import RawTextRichHelpFormatter, RichHelpFormatter
 
-from airflow.api_fastapi.app import get_auth_manager_cls
+from airflow.api_fastapi.common.auth_manager import get_auth_manager_cls
 from airflow.cli.cli_config import (
     DAG_CLI_DICT,
     ActionCommand,
diff --git a/airflow-core/src/airflow/cli/commands/standalone_command.py b/airflow-core/src/airflow/cli/commands/standalone_command.py
index d6f87210fa920..73981d2c30d70 100644
--- a/airflow-core/src/airflow/cli/commands/standalone_command.py
+++ b/airflow-core/src/airflow/cli/commands/standalone_command.py
@@ -27,7 +27,7 @@
 
 from termcolor import colored
 
-from airflow.api_fastapi.app import create_auth_manager
+from airflow.api_fastapi.common.auth_manager import create_auth_manager
 from airflow.configuration import conf
 from airflow.executors import executor_constants
 from airflow.executors.executor_loader import ExecutorLoader
diff --git a/airflow-core/src/airflow/utils/db_manager.py b/airflow-core/src/airflow/utils/db_manager.py
index 6483c446f0170..a20f0f2452d2c 100644
--- a/airflow-core/src/airflow/utils/db_manager.py
+++ b/airflow-core/src/airflow/utils/db_manager.py
@@ -23,7 +23,7 @@
 from sqlalchemy import inspect
 
 from airflow import settings
-from airflow.api_fastapi.app import create_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager_cls
 from airflow.configuration import conf
 from airflow.exceptions import AirflowException
 from airflow.utils.log.logging_mixin import LoggingMixin
@@ -150,7 +150,7 @@ def __init__(self):
         else:
             managers = managers_config.split(",")
         # Add DB manager specified by auth manager (if any)
-        auth_manager_db_manager = create_auth_manager().get_db_manager()
+        auth_manager_db_manager = get_auth_manager_cls().get_db_manager()
         if auth_manager_db_manager and auth_manager_db_manager not in managers:
             managers.append(auth_manager_db_manager)
         for module in managers:
diff --git a/providers/fab/src/airflow/providers/fab/auth_manager/api/auth/backend/basic_auth.py b/providers/fab/src/airflow/providers/fab/auth_manager/api/auth/backend/basic_auth.py
index bf48beff41c9a..c8dc55daeba18 100644
--- a/providers/fab/src/airflow/providers/fab/auth_manager/api/auth/backend/basic_auth.py
+++ b/providers/fab/src/airflow/providers/fab/auth_manager/api/auth/backend/basic_auth.py
@@ -25,7 +25,7 @@
 from flask_appbuilder.const import AUTH_LDAP
 from flask_login import login_user
 
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 
 if TYPE_CHECKING:
     from airflow.providers.fab.auth_manager.fab_auth_manager import FabAuthManager
diff --git a/providers/fab/src/airflow/providers/fab/auth_manager/api/auth/backend/kerberos_auth.py b/providers/fab/src/airflow/providers/fab/auth_manager/api/auth/backend/kerberos_auth.py
index d419524bf1043..d78e2c86ec8e2 100644
--- a/providers/fab/src/airflow/providers/fab/auth_manager/api/auth/backend/kerberos_auth.py
+++ b/providers/fab/src/airflow/providers/fab/auth_manager/api/auth/backend/kerberos_auth.py
@@ -26,7 +26,7 @@
 from flask import Response, current_app, g, make_response, request
 from requests_kerberos import HTTPKerberosAuth
 
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 from airflow.configuration import conf
 from airflow.utils.net import getfqdn
 
diff --git a/providers/fab/src/airflow/providers/fab/auth_manager/api/auth/backend/session.py b/providers/fab/src/airflow/providers/fab/auth_manager/api/auth/backend/session.py
index 8b39c0e8f775c..e8347407823fc 100644
--- a/providers/fab/src/airflow/providers/fab/auth_manager/api/auth/backend/session.py
+++ b/providers/fab/src/airflow/providers/fab/auth_manager/api/auth/backend/session.py
@@ -23,7 +23,7 @@
 
 from flask import Response
 
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 
 CLIENT_AUTH: tuple[str, str] | Any | None = None
 
diff --git a/providers/fab/src/airflow/providers/fab/auth_manager/api_endpoints/role_and_permission_endpoint.py b/providers/fab/src/airflow/providers/fab/auth_manager/api_endpoints/role_and_permission_endpoint.py
index e8aacedea8c83..457ff31d16713 100644
--- a/providers/fab/src/airflow/providers/fab/auth_manager/api_endpoints/role_and_permission_endpoint.py
+++ b/providers/fab/src/airflow/providers/fab/auth_manager/api_endpoints/role_and_permission_endpoint.py
@@ -24,7 +24,7 @@
 from marshmallow import ValidationError
 from sqlalchemy import asc, desc, func, select
 
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 from airflow.providers.fab.auth_manager.models import Action, Role
 from airflow.providers.fab.auth_manager.schemas.role_and_permission_schema import (
     ActionCollection,
diff --git a/providers/fab/src/airflow/providers/fab/auth_manager/api_endpoints/user_endpoint.py b/providers/fab/src/airflow/providers/fab/auth_manager/api_endpoints/user_endpoint.py
index 8c504d6446694..6976358bca54b 100644
--- a/providers/fab/src/airflow/providers/fab/auth_manager/api_endpoints/user_endpoint.py
+++ b/providers/fab/src/airflow/providers/fab/auth_manager/api_endpoints/user_endpoint.py
@@ -25,7 +25,7 @@
 from sqlalchemy import asc, desc, func, select
 from werkzeug.security import generate_password_hash
 
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 from airflow.providers.fab.auth_manager.models import User
 from airflow.providers.fab.auth_manager.schemas.user_schema import (
     UserCollection,
diff --git a/providers/fab/src/airflow/providers/fab/auth_manager/api_fastapi/services/login.py b/providers/fab/src/airflow/providers/fab/auth_manager/api_fastapi/services/login.py
index 0792efd18ce46..5433be11c032c 100644
--- a/providers/fab/src/airflow/providers/fab/auth_manager/api_fastapi/services/login.py
+++ b/providers/fab/src/airflow/providers/fab/auth_manager/api_fastapi/services/login.py
@@ -21,7 +21,7 @@
 from starlette import status
 from starlette.exceptions import HTTPException
 
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 from airflow.configuration import conf
 from airflow.providers.fab.auth_manager.api_fastapi.datamodels.login import LoginBody, LoginResponse
 
diff --git a/providers/fab/src/airflow/providers/fab/www/api_connexion/security.py b/providers/fab/src/airflow/providers/fab/www/api_connexion/security.py
index f238e9de9b356..ad443e07bd18a 100644
--- a/providers/fab/src/airflow/providers/fab/www/api_connexion/security.py
+++ b/providers/fab/src/airflow/providers/fab/www/api_connexion/security.py
@@ -21,7 +21,7 @@
 
 from flask import Response, current_app
 
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 from airflow.providers.fab.www.api_connexion.exceptions import PermissionDenied, Unauthenticated
 
 if TYPE_CHECKING:
diff --git a/providers/fab/src/airflow/providers/fab/www/app.py b/providers/fab/src/airflow/providers/fab/www/app.py
index 873e7adb8f048..c0e8b9c841535 100644
--- a/providers/fab/src/airflow/providers/fab/www/app.py
+++ b/providers/fab/src/airflow/providers/fab/www/app.py
@@ -26,7 +26,7 @@
 from sqlalchemy.engine.url import make_url
 
 from airflow import settings
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 from airflow.configuration import conf
 from airflow.exceptions import AirflowConfigException
 from airflow.logging_config import configure_logging
diff --git a/providers/fab/src/airflow/providers/fab/www/auth.py b/providers/fab/src/airflow/providers/fab/www/auth.py
index 0ac83def61986..25c856e6017f0 100644
--- a/providers/fab/src/airflow/providers/fab/www/auth.py
+++ b/providers/fab/src/airflow/providers/fab/www/auth.py
@@ -30,7 +30,6 @@
     PERMISSION_PREFIX,
 )
 
-from airflow.api_fastapi.app import get_auth_manager
 from airflow.api_fastapi.auth.managers.models.resource_details import (
     AccessView,
     ConnectionDetails,
@@ -39,6 +38,7 @@
     PoolDetails,
     VariableDetails,
 )
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 from airflow.configuration import conf
 from airflow.providers.fab.www.utils import get_fab_auth_manager
 from airflow.utils.net import get_hostname
diff --git a/providers/fab/src/airflow/providers/fab/www/extensions/init_appbuilder.py b/providers/fab/src/airflow/providers/fab/www/extensions/init_appbuilder.py
index 5776d2b2aff6a..d75ef9c32df3e 100644
--- a/providers/fab/src/airflow/providers/fab/www/extensions/init_appbuilder.py
+++ b/providers/fab/src/airflow/providers/fab/www/extensions/init_appbuilder.py
@@ -39,7 +39,7 @@
 from flask_appbuilder.views import IndexView, UtilView
 
 from airflow import settings
-from airflow.api_fastapi.app import create_auth_manager, get_auth_manager
+from airflow.api_fastapi.common.auth_manager import create_auth_manager, get_auth_manager
 from airflow.configuration import conf
 from airflow.providers.fab.www.security_manager import AirflowSecurityManagerV2
 from airflow.providers.fab.www.views import FabIndexView
diff --git a/providers/fab/src/airflow/providers/fab/www/extensions/init_jinja_globals.py b/providers/fab/src/airflow/providers/fab/www/extensions/init_jinja_globals.py
index 5929a40d8f576..d6672aa5b755b 100644
--- a/providers/fab/src/airflow/providers/fab/www/extensions/init_jinja_globals.py
+++ b/providers/fab/src/airflow/providers/fab/www/extensions/init_jinja_globals.py
@@ -21,7 +21,7 @@
 import pendulum
 
 import airflow
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 from airflow.configuration import conf
 from airflow.utils.net import get_hostname
 from airflow.utils.platform import get_airflow_git_version
diff --git a/providers/fab/src/airflow/providers/fab/www/extensions/init_views.py b/providers/fab/src/airflow/providers/fab/www/extensions/init_views.py
index 76883ae3ad891..c80e0005aaf12 100644
--- a/providers/fab/src/airflow/providers/fab/www/extensions/init_views.py
+++ b/providers/fab/src/airflow/providers/fab/www/extensions/init_views.py
@@ -25,7 +25,7 @@
 from connexion.exceptions import BadRequestProblem, ProblemException
 from flask import request
 
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 from airflow.providers.fab.www.api_connexion.exceptions import common_error_handler
 
 if TYPE_CHECKING:
diff --git a/providers/fab/src/airflow/providers/fab/www/security_manager.py b/providers/fab/src/airflow/providers/fab/www/security_manager.py
index 7f3e4ef262035..6ddfc9a2ffc3c 100644
--- a/providers/fab/src/airflow/providers/fab/www/security_manager.py
+++ b/providers/fab/src/airflow/providers/fab/www/security_manager.py
@@ -22,7 +22,7 @@
 from flask_limiter import Limiter
 from flask_limiter.util import get_remote_address
 
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 from airflow.providers.fab.www.utils import CustomSQLAInterface, get_method_from_fab_action_map
 from airflow.utils.log.logging_mixin import LoggingMixin
 
diff --git a/providers/fab/src/airflow/providers/fab/www/utils.py b/providers/fab/src/airflow/providers/fab/www/utils.py
index 3bde1300ec8a8..4d43d4b0aa65b 100644
--- a/providers/fab/src/airflow/providers/fab/www/utils.py
+++ b/providers/fab/src/airflow/providers/fab/www/utils.py
@@ -28,7 +28,7 @@
 from sqlalchemy import types
 from sqlalchemy.ext.associationproxy import AssociationProxy
 
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 from airflow.configuration import conf
 from airflow.providers.fab.www.security.permissions import (
     ACTION_CAN_ACCESS_MENU,
diff --git a/providers/fab/src/airflow/providers/fab/www/views.py b/providers/fab/src/airflow/providers/fab/www/views.py
index 87a801665fcbe..ef5d64d155bbb 100644
--- a/providers/fab/src/airflow/providers/fab/www/views.py
+++ b/providers/fab/src/airflow/providers/fab/www/views.py
@@ -29,8 +29,8 @@
 )
 from flask_appbuilder import IndexView, expose
 
-from airflow.api_fastapi.app import get_auth_manager
 from airflow.api_fastapi.auth.managers.base_auth_manager import COOKIE_NAME_JWT_TOKEN
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 from airflow.configuration import conf
 
 # Following the release of https://github.com/python/cpython/issues/102153 in Python 3.9.17 on
diff --git a/providers/fab/tests/unit/fab/auth_manager/api_endpoints/remote_user_api_auth_backend.py b/providers/fab/tests/unit/fab/auth_manager/api_endpoints/remote_user_api_auth_backend.py
index 247bb168fd042..ac517d8db049a 100644
--- a/providers/fab/tests/unit/fab/auth_manager/api_endpoints/remote_user_api_auth_backend.py
+++ b/providers/fab/tests/unit/fab/auth_manager/api_endpoints/remote_user_api_auth_backend.py
@@ -26,7 +26,7 @@
 from flask import Response, request
 from flask_login import login_user
 
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 
 if TYPE_CHECKING:
     from requests.auth import AuthBase
diff --git a/providers/fab/tests/unit/fab/auth_manager/test_security.py b/providers/fab/tests/unit/fab/auth_manager/test_security.py
index 17f5f562b1134..e4dd378d9eeb4 100644
--- a/providers/fab/tests/unit/fab/auth_manager/test_security.py
+++ b/providers/fab/tests/unit/fab/auth_manager/test_security.py
@@ -43,7 +43,7 @@
     from airflow.providers.fab.auth_manager.models import assoc_permission_role
     from airflow.providers.fab.auth_manager.models.anonymous_user import AnonymousUser
 
-from airflow.api_fastapi.app import get_auth_manager
+from airflow.api_fastapi.common.auth_manager import get_auth_manager
 from airflow.providers.fab.www import app as application
 from airflow.providers.fab.www.security import permissions
 from airflow.providers.fab.www.security.permissions import ACTION_CAN_READ