CVE-2026-10542

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

Scoring

Severity

MEDIUM

CVSS base score

5

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

EPSS probability

0.13%

CWE

CWE-639

Published

2026-09-14

Last modified

2026-09-14

Affected products

• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost

Weakness type

• CWE-639

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