An issue was discovered in Mattermost Server before 5.12.0, 5.11.1, 5.10.2, 5.9.2, and…
Priority LOW 39CWE-352Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Tampering
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-352.
Summary
An issue was discovered in Mattermost Server before 5.12.0, 5.11.1, 5.10.2, 5.9.2, and 4.10.10. The login page allows CSRF.
Why it matters now
EPSS 0.00488 42nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | before 4.10.10; 5.9.0 to before 5.9.2; 5.10.0 to before 5.10.2; 5.11.0 to before 5.11.1 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:5.12.0:rc1:*:*:*:*:*:* | 5.12.0 rc1 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:5.12.0:rc2:*:*:*:*:*:* | 5.12.0 rc2 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:5.12.0:rc3:*:*:*:*:*:* | 5.12.0 rc3 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:5.12.0:rc4:*:*:*:*:*:* | 5.12.0 rc4 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:5.12.0:rc5:*:*:*:*:*:* | 5.12.0 rc5 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:5.12.0:rc6:*:*:*:*:*:* | 5.12.0 rc6 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions before 4.10.10; 5.9.0 to before 5.9.2; 5.10.0 to before 5.10.2; 5.11.0 to before 5.11.1 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:5.12.0:rc1:*:*:*:*:*:* Versions 5.12.0 rc1 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:5.12.0:rc2:*:*:*:*:*:* Versions 5.12.0 rc2 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:5.12.0:rc3:*:*:*:*:*:* Versions 5.12.0 rc3 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:5.12.0:rc4:*:*:*:*:*:* Versions 5.12.0 rc4 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:5.12.0:rc5:*:*:*:*:*:* Versions 5.12.0 rc5 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:5.12.0:rc6:*:*:*:*:*:* Versions 5.12.0 rc6 Vulnerable ·Mattermost
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2019-20865
- 2026-10-03 Alias added: GHSA-c22c-gjcp-pjjp
References
Advisory 1
More Mattermost Server vulnerabilities
- TI-2025-18933 Arbitrary file read in Mattermost Boards via import & export board archive CVSS 3.1CRITICAL 9.9
- TI-2025-04465 Path Traversal Leading to RCE by Any Authenticated Mattermost User CVSS 3.1CRITICAL 9.9
- TI-2017-14068 An issue was discovered in Mattermost Server before 3.6.2. CVSS 3.1CRITICAL 9.8
- TI-2017-14060 An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. CVSS 3.1CRITICAL 9.8
- TI-2017-14048 An issue was discovered in Mattermost Server before 4.1.0, 4.0.4, and 3.10.3. CVSS 3.1CRITICAL 9.8
- TI-2025-14360 Arbitrary file read via block duplication in Mattermost Boards CVSS 3.1CRITICAL 9.9
Sources
- CVE-2019-20865 · CVE Program
- CVE-2019-20865 · NVD
- FIRST EPSS
- GHSA-c22c-gjcp-pjjp · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences