Vulnerabilities CVE-2026-9571

CVE-2026-9571

Medium

Open

TLP:CLEAR

Deactivated user accounts can continue to obtain valid OAuth access tokens via refresh token grant in Mattermost

NVD CVE.org

Ransomware

AI Analysis

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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

Details

CVSS Score: 5.9
EPSS Score ⓘ: 0.17%

7.1th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
Confidence: 90%
Published: Jul 13, 2026
Last Modified: Jul 14, 2026

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