CVE-2025-10545 — Guest user can add unauthorized team users to private channels
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 m…
Published: 2025-10-16 · CVSS: 3.1 · CVSS 3.1
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: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7