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-rw-r--r--synapse/handlers/typing.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/handlers/typing.py b/synapse/handlers/typing.py
index c55221c6df..fa903c251c 100644
--- a/synapse/handlers/typing.py
+++ b/synapse/handlers/typing.py
@@ -67,6 +67,8 @@ class TypingNotificationHandler(BaseHandler):
         if target_user != auth_user:
             raise AuthError(400, "Cannot set another user's typing state")
 
+        yield self.auth.check_joined_room(room_id, target_user.to_string())
+
         logger.debug(
             "%s has started typing in %s", target_user.to_string(), room_id
         )
@@ -102,6 +104,8 @@ class TypingNotificationHandler(BaseHandler):
         if target_user != auth_user:
             raise AuthError(400, "Cannot set another user's typing state")
 
+        yield self.auth.check_joined_room(room_id, target_user.to_string())
+
         logger.debug(
             "%s has stopped typing in %s", target_user.to_string(), room_id
         )