CVE-2026-16046

Missing run-state validation on finished playbook runs

State: Published
Severity: 3.5 Low
Published: Aug 17, 2026
Updated: Aug 18, 2026
Reserved: Jul 17, 2026

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

Scores

CVSS	Score	Vector	Source
3.1	3.5 Low	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N	Mattermost

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
MattermostMattermost	11.7.0 through 11.7.6Affected 10.11.0 through 10.11.21Affected 11.9.0Not affected 11.7.7Not affected 10.11.22Not affected

References

MMSA-2026-00675vendor-advisory

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