CVE-2026-9571

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CVSS 3.1

6.5 medium

EPSS

<1%p23

Published

Jul 13, 2026 (Jul 13, 2026)

Modified

Jul 15, 2026

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

Vendors: mattermost
Products: mattermost server
Weakness: CWE-305
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

NVD CVE.org GitHub PoCs EPSS (0.3%)

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