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-rw-r--r--synapse/event_auth.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/synapse/event_auth.py b/synapse/event_auth.py
index 7a1adc2750..ca0293a3dc 100644
--- a/synapse/event_auth.py
+++ b/synapse/event_auth.py
@@ -155,6 +155,12 @@ def check_auth_rules_for_event(
                 "which is in room %s"
                 % (event.event_id, room_id, auth_event.event_id, auth_event.room_id),
             )
+        if auth_event.rejected_reason:
+            raise AuthError(
+                403,
+                "During auth for event %s: found rejected event %s in the state"
+                % (event.event_id, auth_event.event_id),
+            )
 
     # Implementation of https://matrix.org/docs/spec/rooms/v1#authorization-rules
     #