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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 6607d08488..adb9a776e0 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -677,6 +677,11 @@ class Auth(object):
             if e_type == Membership.JOIN:
                 if member_event and not is_public:
                     auth_ids.append(member_event.event_id)
+                if ThirdPartyInvites.has_join_keys(event.content):
+                    key = (EventTypes.ThirdPartyInvite, event.content["token"])
+                    invite = current_state.get(key)
+                    if invite:
+                        auth_ids.append(invite.event_id)
             else:
                 if member_event:
                     auth_ids.append(member_event.event_id)