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CVE-2026-9571

MEDIUM CVSS: 5.9 Published: 2026-07-13 Modified: 2026-07-15

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

Affected Platforms

Mattermost Mattermost Server

Weakness Type

CWE-305

References