Security Advisory

CVE-2026-82920

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-09-14 13:59:01

Last updated 2026-09-14 19:23:01

Assigner Mattermost

CVSS score 5.5

State PUBLISHED

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

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