Improper access control in Mattermost
Priority LOW 28CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-284.
Summary
Mattermost versions 8.1.x before 8.1.11, 9.3.x before 9.3.3, 9.4.x before 9.4.4, and 9.5.x before 9.5.2 fail to authenticate the source of certain types of post actions, allowing an authenticated attacker to create posts as other users via a crafted post action.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00223 13th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 9.6.0, 9.5.2, 9.4.4 +2github.com/mattermost/mattermost/server/v8 (Go): 8.1.11, 9.5.2, 9.4.4 +1
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 | 9.5.0 – 9.5.1; 9.4.0 – 9.4.3; 9.3.0 – 9.3.2; 8.1.0 – 8.1.10 | 9.6.0, 9.5.2, 9.4.4, 9.3.3, 8.1.11 | Patch available | CNA |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 8.1.0 to before 8.1.11 | 8.1.11 | Patch available | GHSA-wp43-vprh-c3w5 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.5.0 to before 9.5.2 | 9.5.2 | Patch available | GHSA-wp43-vprh-c3w5 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.4.0 to before 9.4.4 | 9.4.4 | Patch available | GHSA-wp43-vprh-c3w5 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.3.0 to before 9.3.3 | 9.3.3 | Patch available | GHSA-wp43-vprh-c3w5 |
- Mattermost VendorMattermost Affected 9.5.0 – 9.5.1; 9.4.0 – 9.4.3; 9.3.0 – 9.3.2; 8.1.0 – 8.1.10 Fixed in 9.6.0, 9.5.2, 9.4.4, 9.3.3, 8.1.11 Patch available CNA
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 8.1.0 to before 8.1.11 Fixed in 8.1.11 Patch available GHSA-wp43-vprh-c3w5
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.5.0 to before 9.5.2 Fixed in 9.5.2 Patch available GHSA-wp43-vprh-c3w5
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.4.0 to before 9.4.4 Fixed in 9.4.4 Patch available GHSA-wp43-vprh-c3w5
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.3.0 to before 9.3.3 Fixed in 9.3.3 Patch available GHSA-wp43-vprh-c3w5
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 8.1.0 to before 8.1.11; 9.3.0 to before 9.3.3; 9.4.0 to before 9.4.4; 9.5.0 to before 9.5.2 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 8.1.0 to before 8.1.11; 9.3.0 to before 9.3.3; 9.4.0 to before 9.4.4; 9.5.0 to before 9.5.2 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 9.6.0, 9.5.2, 9.4.4, 9.3.3, 8.1.11
- Fix · GHSA-wp43-vprh-c3w5 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.1.11 Advisory →
- Fix · GHSA-wp43-vprh-c3w5 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.5.2 Advisory →
- Fix · GHSA-wp43-vprh-c3w5 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.4.4 Advisory →
- Fix · GHSA-wp43-vprh-c3w5 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.3.3 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2024-2447
- 2026-10-03 Alias added: GHSA-wp43-vprh-c3w5
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-2024-2447 · CVE Program
- CVE-2024-2447 · NVD
- FIRST EPSS
- GHSA-wp43-vprh-c3w5 · 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