CVE-2026-82920

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7 fail to enforce authorization boundaries on the access control policy update endpoint which allows a channel or team administrator to detach a system-assigned ABAC parent policy via a crafted PUT /api/v4/access_control_policies request with an empty imports list.. Mattermost Advisory ID: MMSA-2026-00724

Scoring

Severity

MEDIUM

CVSS base score

5.5

CVSS vector

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

EPSS probability

0.15%

CWE

CWE-863

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

Weakness type

• CWE-863

Related vulnerabilities

• CVE-2026-87544 — Incorrect authorization in Extensions in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to bypass system
• CVE-2026-87492 — Incorrect authorization in DevTools in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to potentially exe
• CVE-2026-87570 — Incorrect authorization in SiteIsolation in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compr
• CVE-2026-79708 — Incorrect Authorization in GitLab
• CVE-2026-87481 — Incorrect authorization in WebView in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote attacker who h
• CVE-2026-87644 — Incorrect authorization in Views in Google Chrome on on Windows prior to 153.0.8010.36 allowed a remote attacker who had
• CVE-2026-87505 — Incorrect authorization in FileSystem in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromi
• CVE-2026-87499 — Incorrect authorization in Network in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised

Markdown version · Browse all CVEs