CVE-2025-10545 — Guest user can add unauthorized team users to private channels

CVE-2025-10545

Guest user can add unauthorized team users to private channels PUBLISHED

Description (CNA)

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

Affected (CNA)

Vendor / product	Versions
Mattermost / Mattermost	affected 10.5.0 through 10.5.10; affected 10.11.0 through 10.11.2; unaffected 10.12.0; unaffected 10.5.11; unaffected 10.11.3

CWE

CWE-863

References

https://mattermost.com/security-updates

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.