Mattermost versions 9.5.x < 9.5.3, 9.7.x < 9.7.1 and 8.1.x < 8.1.12 fail to perform a proper authorization check in the /api/v4/groups/<group-id>/channels/<channel-id>/link endpoint which allows a user to learn the members of an AD/LDAP group that is linked to a team by adding the group to a channel, even if the user has no access to the team.
Publication date: Sun, 26 May 2024 14:15:00 +0000