CVE-2026-6341 — Incomplete group locking implementation

CVE-2026-6341

Incomplete group locking implementation PUBLISHED

Description (CNA)

Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to have API-level checks on which groups the user can create issues or attach comments to which allows a user that is member of multiple groups to create issues to a locked group via direct API requests. Mattermost Advisory ID: MMSA-2026-00602

Affected (CNA)

Vendor / product	Versions
Mattermost / Mattermost	affected 0 through 11.1.5; affected 0 through 10.13.11; affected 0 through 11.3.4; unaffected 11.6.0; unaffected 11.5.2; unaffected 10.11.14; unaffected 11.4.4

CWE

CWE-863

References

https://mattermost.com/security-updates

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.