Vulnerability Database

323,358

Total vulnerabilities in the database

CVE-2026-0999

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

  • Published: Feb 16, 2026
  • Updated: Feb 17, 2026
  • CVE: CVE-2026-0999
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 5.4
  • AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CWEs:

Software From Fixed in
mattermost / mattermost_server 10.11.0 10.11.10
mattermost / mattermost_server 11.1.0 11.1.3
mattermost / mattermost_server 11.2.0 11.2.2