VDB
CVE-2026-0999
CVE-2026-0999
PUBLISHED
CVSS 5.400000095367432 MEDIUM
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
EPSS 0.18% · 6.7th percentile
Risk Scores
CVSS 3.1
5.400000095367432
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
EPSS Score
0.18%
6.7th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| mattermost | mattermost_server | 11.1.0, 10.11.0, 11.2.0 |
| Mattermost | Mattermost | 11.1.0, 10.11.0, 11.3.0 |
| github.com | mattermost/mattermost-server | 0, 10.11.0, 11.2.0 |
| github.com | mattermost/mattermost/server/v8 | 0, 0 |
Timeline
- Feb 16, 2026 CVE Published
- Feb 16, 2026 EPSS Score
- Feb 18, 2026 EPSS Score
- Feb 18, 2026 CVE Updated
- Feb 20, 2026 EPSS Score
- Feb 22, 2026 EPSS Score
- Feb 24, 2026 EPSS Score
- Feb 26, 2026 EPSS Score
- Feb 28, 2026 EPSS Score
- Mar 2, 2026 EPSS Score
- Mar 4, 2026 EPSS Score
- Mar 6, 2026 EPSS Score