Bypass of System Admin User Deactivation Controls for Personal Access Tokens in Mattermost Server
Priority LOW 24CWE-303Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
Mattermost versions 10.7.x <= 10.7.0, 10.6.x <= 10.6.2, 10.5.x <= 10.5.3, 9.11.x <= 9.11.12 fails to properly invalidate personal access tokens upon user deactivation, allowing deactivated users to maintain full system access by exploiting access token validation flaws via continued usage of previously issued tokens.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00228 13th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 10.8.0, 10.7.1, 10.6.3 +2github.com/mattermost/mattermost/server/v8 (Go): 10.7.1, 10.6.3, 10.5.4 +2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mattermost | Mattermost | 10.7.0; 10.6.0 – 10.6.2; 10.5.0 – 10.5.3; 9.11.0 – 9.11.12 | 10.8.0, 10.7.1, 10.6.3, 10.5.4, 9.11.13 | Patch available | CNA |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 10.7.0-rc1 to before 10.7.1 | 10.7.1 | Patch available | GHSA-mc2f-jgj6-6cp3 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 10.6.0-rc1 to before 10.6.3 | 10.6.3 | Patch available | GHSA-mc2f-jgj6-6cp3 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 10.0.0-rc1 to before 10.5.4 | 10.5.4 | Patch available | GHSA-mc2f-jgj6-6cp3 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.0.0-rc1 to before 9.11.13 | 9.11.13 | Patch available | GHSA-mc2f-jgj6-6cp3 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | before 8.0.0-20250402193107-65343f84a783 | 8.0.0-20250402193107-65343f84a783 | Patch available | GHSA-mc2f-jgj6-6cp3 |
- Mattermost VendorMattermost Affected 10.7.0; 10.6.0 – 10.6.2; 10.5.0 – 10.5.3; 9.11.0 – 9.11.12 Fixed in 10.8.0, 10.7.1, 10.6.3, 10.5.4, 9.11.13 Patch available CNA
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.7.0-rc1 to before 10.7.1 Fixed in 10.7.1 Patch available GHSA-mc2f-jgj6-6cp3
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.6.0-rc1 to before 10.6.3 Fixed in 10.6.3 Patch available GHSA-mc2f-jgj6-6cp3
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.0.0-rc1 to before 10.5.4 Fixed in 10.5.4 Patch available GHSA-mc2f-jgj6-6cp3
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.0.0-rc1 to before 9.11.13 Fixed in 9.11.13 Patch available GHSA-mc2f-jgj6-6cp3
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20250402193107-65343f84a783 Fixed in 8.0.0-20250402193107-65343f84a783 Patch available GHSA-mc2f-jgj6-6cp3
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 9.11.0 to before 9.11.13; 10.5.0 to before 10.5.4; 10.6.0 to before 10.6.3; 10.7.0 to before 10.7.1 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.11.0 to before 9.11.13; 10.5.0 to before 10.5.4; 10.6.0 to before 10.6.3; 10.7.0 to before 10.7.1 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 10.8.0, 10.7.1, 10.6.3, 10.5.4, 9.11.13
- Fix · GHSA-mc2f-jgj6-6cp3 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.7.1 Advisory →
- Fix · GHSA-mc2f-jgj6-6cp3 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.6.3 Advisory →
- Fix · GHSA-mc2f-jgj6-6cp3 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.5.4 Advisory →
- Fix · GHSA-mc2f-jgj6-6cp3 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.11.13 Advisory →
- Fix · GHSA-mc2f-jgj6-6cp3 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250402193107-65343f84a783 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-3230
- 2026-10-03 Alias added: GHSA-mc2f-jgj6-6cp3
References
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-2025-3230 · CVE Program
- CVE-2025-3230 · NVD
- FIRST EPSS
- GHSA-mc2f-jgj6-6cp3 · 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