diff --git a/airflow-core/src/airflow/api_fastapi/core_api/openapi/v2-rest-api-generated.yaml b/airflow-core/src/airflow/api_fastapi/core_api/openapi/v2-rest-api-generated.yaml
index 5ed96855c24ac..fa2e13c699898 100644
--- a/airflow-core/src/airflow/api_fastapi/core_api/openapi/v2-rest-api-generated.yaml
+++ b/airflow-core/src/airflow/api_fastapi/core_api/openapi/v2-rest-api-generated.yaml
@@ -10294,6 +10294,12 @@ paths:
               schema:
                 $ref: '#/components/schemas/HTTPExceptionResponse'
           description: Temporary Redirect
+        '400':
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/HTTPExceptionResponse'
+          description: Bad Request
         '422':
           description: Validation Error
           content:
diff --git a/airflow-core/src/airflow/api_fastapi/core_api/routes/public/auth.py b/airflow-core/src/airflow/api_fastapi/core_api/routes/public/auth.py
index f85bcec3a6123..30e22c51b671d 100644
--- a/airflow-core/src/airflow/api_fastapi/core_api/routes/public/auth.py
+++ b/airflow-core/src/airflow/api_fastapi/core_api/routes/public/auth.py
@@ -36,14 +36,16 @@
 
 @auth_router.get(
     "/login",
-    responses=create_openapi_http_exception_doc([status.HTTP_307_TEMPORARY_REDIRECT]),
+    responses=create_openapi_http_exception_doc(
+        [status.HTTP_307_TEMPORARY_REDIRECT, status.HTTP_400_BAD_REQUEST]
+    ),
 )
 def login(request: Request, auth_manager: AuthManagerDep, next: None | str = None) -> RedirectResponse:
     """Redirect to the login URL depending on the AuthManager configured."""
     login_url = auth_manager.get_url_login()
 
     if next and not is_safe_url(next, request=request):
-        raise HTTPException(status_code=400, detail="Invalid or unsafe next URL")
+        raise HTTPException(status.HTTP_400_BAD_REQUEST, detail="Invalid or unsafe next URL")
 
     if next:
         login_url += f"?{urlencode({'next': next})}"
diff --git a/airflow-core/src/airflow/ui/openapi-gen/requests/services.gen.ts b/airflow-core/src/airflow/ui/openapi-gen/requests/services.gen.ts
index ec044ac30856d..c5de12f7a2969 100644
--- a/airflow-core/src/airflow/ui/openapi-gen/requests/services.gen.ts
+++ b/airflow-core/src/airflow/ui/openapi-gen/requests/services.gen.ts
@@ -4086,6 +4086,7 @@ export class LoginService {
             },
             errors: {
                 307: 'Temporary Redirect',
+                400: 'Bad Request',
                 422: 'Validation Error'
             }
         });
diff --git a/airflow-core/src/airflow/ui/openapi-gen/requests/types.gen.ts b/airflow-core/src/airflow/ui/openapi-gen/requests/types.gen.ts
index 4d401bfc1a496..c71cf1c9d86b2 100644
--- a/airflow-core/src/airflow/ui/openapi-gen/requests/types.gen.ts
+++ b/airflow-core/src/airflow/ui/openapi-gen/requests/types.gen.ts
@@ -7264,6 +7264,10 @@ export type $OpenApiTs = {
                  * Temporary Redirect
                  */
                 307: HTTPExceptionResponse;
+                /**
+                 * Bad Request
+                 */
+                400: HTTPExceptionResponse;
                 /**
                  * Validation Error
                  */