flows: return correct status code on error

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

authentik/flows/stage.py

@@ -249,7 +249,7 @@ class ChallengeStageView(StageView):
                 "f(ch): invalid challenge response",
                 errors=challenge_response.errors,
             )
-        return HttpChallengeResponse(challenge_response)
+        return HttpChallengeResponse(challenge_response, status=400)
 
 
 class AccessDeniedStage(ChallengeStageView):

authentik/flows/views/executor.py

@@ -258,6 +258,11 @@ class FlowExecutorView(APIView):
                 serializers=challenge_types,
                 resource_type_field_name="component",
             ),
+            400: PolymorphicProxySerializer(
+                component_name="ChallengeTypes",
+                serializers=challenge_types,
+                resource_type_field_name="component",
+            ),
         },
         request=OpenApiTypes.NONE,
         parameters=[
@@ -305,6 +310,11 @@ class FlowExecutorView(APIView):
                 serializers=challenge_types,
                 resource_type_field_name="component",
             ),
+            400: PolymorphicProxySerializer(
+                component_name="ChallengeTypes",
+                serializers=challenge_types,
+                resource_type_field_name="component",
+            ),
         },
         request=PolymorphicProxySerializer(
             component_name="FlowChallengeResponse",