CVE-2021-39163 log

Severity Medium
Remote Yes
Type Information disclosure
In matrix-synapse versions 1.41.0 and prior, unauthorised users can access the name, avatar, topic and number of members of a room if they know the ID of the room. This vulnerability is limited to homeservers where the vulnerable homeserver is in the room and untrusted users are permitted to create groups (communities). By default, only homeserver administrators can create groups. However, homeserver administrators can already access this information in the database or using the admin API. As a result, only homeservers where the configuration setting `enable_group_creation` has been set to `true` are impacted.
Group Package Affected Fixed Severity Status Ticket
AVG-2334 matrix-synapse 1.40.0-1 1.41.1-1 Medium Fixed