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CVE-2026-82920

MEDIUM CVSS: 5.5 Published: 2026-09-14 Modified: 2026-09-16

Description

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

Affected Platforms

Unknown

Weakness Type

CWE-863

References