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-rw-r--r--synapse/handlers/_base.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/synapse/handlers/_base.py b/synapse/handlers/_base.py
index 884572df97..2d56af5027 100644
--- a/synapse/handlers/_base.py
+++ b/synapse/handlers/_base.py
@@ -370,6 +370,12 @@ class BaseHandler(object):
                         "You don't have permission to redact events"
                     )
 
+        if event.type == EventTypes.Create and context.current_state:
+            raise AuthError(
+                403,
+                "Changing the room create event is forbidden",
+            )
+
         action_generator = ActionGenerator(self.hs)
         yield action_generator.handle_push_actions_for_event(
             event, context, self