Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate channel action ownership which allows channel managers to update actions in other channels via the channel action update endpoint.. Mattermost Advisory ID: MMSA-2026-00692

Project Subscriptions

Vendors Products
Mattermost Subscribe
Mattermost Subscribe
Advisories

No advisories yet.

Fixes

Solution

Update Mattermost to versions 11.10.0, 11.9.1, 11.8.5, 11.7.8, 10.11.23 or higher.


Workaround

No workaround given by the vendor.

References
History

Mon, 14 Sep 2026 12:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 14 Sep 2026 11:45:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost

Mon, 14 Sep 2026 10:45:00 +0000

Type Values Removed Values Added
Description Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate channel action ownership which allows channel managers to update actions in other channels via the channel action update endpoint.. Mattermost Advisory ID: MMSA-2026-00692
Title Playbooks channel action update validation issue
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2026-09-14T11:19:45.549Z

Reserved: 2026-06-01T12:34:54.592Z

Link: CVE-2026-10542

cve-icon Vulnrichment

Updated: 2026-09-14T11:13:39.347Z

cve-icon NVD

Status : Received

Published: 2026-09-14T11:17:02.447

Modified: 2026-09-14T12:17:37.807

Link: CVE-2026-10542

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-14T11:30:08Z

Weaknesses