CVE-2025-41443: Missing Authorization

Mattermost versions 10.5.x = 10.5.12, 10.11.x = 10.11.2 fail to properly validate guest user permissions when accessing channel information which allows guest users to discover active public channels and their metadata via the /api/v4/teams/teamid/channels/ids endpoint...

CVE-2025-4128: Incorrect Authorization

Mattermost versions 10.5.x = 10.5.4, 9.11.x = 9.11.13 fail to properly restrict API access to team information, allowing guest users to bypass permissions and view information about public teams they are not members of via a direct API call to /api/v4/teams/teamid...