Security Advisory

CVE-2026-9571

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-13 07:50:55

Last updated 2026-07-15 04:00:07

Assigner Mattermost

CVSS score 5.9

State PUBLISHED

Description

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to invalidate OAuth refresh tokens upon user account deactivation, which allows a deactivated user or an attacker in possession of a valid refresh token to obtain new functional access tokens via the OAuth refresh token grant endpoint.. Mattermost Advisory ID: MMSA-2026-00680

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