CVE-2026-82920

MediumCVSS 5.5/10Last modified Oct 7, 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

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-863

Affected software

Vendor	Product	Versions
Mattermost	Mattermost	>= 11.9.0, <= 11.9.0; >= 11.8.0, <= 11.8.4; >= 11.7.0, <= 11.7.7

References

https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: Sep 14, 2026
Last modified: Oct 7, 2026
NVD status: Analyzed

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