CVE-2025-10545
Guest user can add unauthorized team users to private channels
Summary
Guest user can add unauthorized team users to private channels
Original description
The description as published by the source.
Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the /api/v4/channels/{channel_id}/members endpoint
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
References
- advisory github.com
- advisory nvd.nist.gov
- web mattermost.com