CVE-2026-82920

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CVSS 3.1

5.5 medium

EPSS

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Published

Sep 14, 2026 (1d ago)

Modified

Sep 14, 2026

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

Weakness: CWE-863
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (—)

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