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-rw-r--r--synapse/api/auth.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index 3d1ce4e09e..be67ab4f4d 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -121,6 +121,11 @@ class Auth(object):
 
             # FIXME: Temp hack
             if event.type == EventTypes.Aliases:
+                if not event.is_state():
+                    raise AuthError(
+                        403,
+                        "Alias event must be a state event",
+                    )
                 if not event.state_key:
                     raise AuthError(
                         403,