Is CVE-2026-16046 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-16046?

CVE-2026-16046 has a CVSS v3 severity of MEDIUM (4.3).

Back

CVE-2026-16046

Description

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to enforce run-state validation on write operations for finished playbook runs which allows a run participant to modify status, checklists, retrospective content, ownership, and participants on completed runs via REST and GraphQL API requests. Mattermost Advisory ID: MMSA-2026-00675