VULNERABILITY INTELLIGENCE

CVE-2026-0999

CVSS score5.4 MEDIUM
EPSS probability0.20%
CISA KEVNot currently listed
Published2026-02-16
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Description

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate login method restrictions which allows an authenticated user to bypass SSO-only login requirements via userID-based authentication. Mattermost Advisory ID: MMSA-2025-00548

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-303

Primary references