CVEvulnerability

CVE-2026-9571

6.5 MEDIUM Published 2026-07-13 Modified 2026-07-15 Official page ↗
Status
Analyzed
Published
2026-07-13
Last modified
2026-07-15
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.9 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-305

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 configurations

• mattermost mattermost server (>= 10.11.0 < 10.11.20) • mattermost mattermost server (>= 11.6.0 < 11.6.5) • mattermost mattermost server (>= 11.7.0 < 11.7.3)

Related

Weakness · CWE (1)

  • CWE-305 Authentication Bypass by Primary Weakness weakness

References