Import Path Traversal Enables Unauthorized Unsigned Plugin Installation
Priority LOW 31CWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.
Summary
Mattermost versions 10.9.x <= 10.9.1, 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate file paths during plugin import operations which allows restricted admin users to install unauthorized custom plugins via path traversal in the import functionality, bypassing plugin signature enforcement and marketplace restrictions.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00494 42nd percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 10.10.0, 10.9.2, 10.8.4 +2github.com/mattermost/mattermost-server (Go): 10.9.2, 10.8.4, 10.5.9 +1+1 more product
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 | 10.9.0 – 10.9.1; 10.8.0 – 10.8.3; 10.5.0 – 10.5.8; 9.11.0 – 9.11.17 | 10.10.0, 10.9.2, 10.8.4, 10.5.9, 9.11.18 | Patch available | CNA |
| — | github.com/mattermost/mattermost-server (Go) | 10.9.0 to before 10.9.2 | 10.9.2 | Patch available | GHSA-gq3r-5833-5532 |
| — | github.com/mattermost/mattermost-server (Go) | 10.8.0 to before 10.8.4 | 10.8.4 | Patch available | GHSA-gq3r-5833-5532 |
| — | github.com/mattermost/mattermost-server (Go) | 10.5.0 to before 10.5.9 | 10.5.9 | Patch available | GHSA-gq3r-5833-5532 |
| — | github.com/mattermost/mattermost-server (Go) | 9.11.0 to before 9.11.18 | 9.11.18 | Patch available | GHSA-gq3r-5833-5532 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | before 8.0.0-20250619095651-9dd0b3943e55 | 8.0.0-20250619095651-9dd0b3943e55 | Patch available | GHSA-gq3r-5833-5532 |
| — | github.com/mattermost/mattermost-server/v5 (Go) | up to 5.11.1 | — | No fix listed | GHSA-gq3r-5833-5532 |
| — | github.com/mattermost/mattermost-server/v6 (Go) | up to 6.7.2 | — | No fix listed | GHSA-gq3r-5833-5532 |
- Mattermost VendorMattermost Affected 10.9.0 – 10.9.1; 10.8.0 – 10.8.3; 10.5.0 – 10.5.8; 9.11.0 – 9.11.17 Fixed in 10.10.0, 10.9.2, 10.8.4, 10.5.9, 9.11.18 Patch available CNA
- github.com/mattermost/mattermost-server (Go) Vendor— Affected 10.9.0 to before 10.9.2 Fixed in 10.9.2 Patch available GHSA-gq3r-5833-5532
- github.com/mattermost/mattermost-server (Go) Vendor— Affected 10.8.0 to before 10.8.4 Fixed in 10.8.4 Patch available GHSA-gq3r-5833-5532
- github.com/mattermost/mattermost-server (Go) Vendor— Affected 10.5.0 to before 10.5.9 Fixed in 10.5.9 Patch available GHSA-gq3r-5833-5532
- github.com/mattermost/mattermost-server (Go) Vendor— Affected 9.11.0 to before 9.11.18 Fixed in 9.11.18 Patch available GHSA-gq3r-5833-5532
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20250619095651-9dd0b3943e55 Fixed in 8.0.0-20250619095651-9dd0b3943e55 Patch available GHSA-gq3r-5833-5532
- github.com/mattermost/mattermost-server/v5 (Go) Vendor— Affected up to 5.11.1 Fixed in — No fix listed GHSA-gq3r-5833-5532
- github.com/mattermost/mattermost-server/v6 (Go) Vendor— Affected up to 6.7.2 Fixed in — No fix listed GHSA-gq3r-5833-5532
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 9.11.0 to before 9.11.18; 10.5.0 to before 10.5.9; 10.8.0 to before 10.8.4; 10.9.0 to before 10.9.2 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.11.0 to before 9.11.18; 10.5.0 to before 10.5.9; 10.8.0 to before 10.8.4; 10.9.0 to before 10.9.2 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 10.10.0, 10.9.2, 10.8.4, 10.5.9, 9.11.18
- Fix · GHSA-gq3r-5833-5532 github.com/mattermost/mattermost-server (Go) Fixed in 10.9.2 Advisory →
- Fix · GHSA-gq3r-5833-5532 github.com/mattermost/mattermost-server (Go) Fixed in 10.8.4 Advisory →
- Fix · GHSA-gq3r-5833-5532 github.com/mattermost/mattermost-server (Go) Fixed in 10.5.9 Advisory →
- Fix · GHSA-gq3r-5833-5532 github.com/mattermost/mattermost-server (Go) Fixed in 9.11.18 Advisory →
- Fix · GHSA-gq3r-5833-5532 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250619095651-9dd0b3943e55 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-36530
- 2026-10-03 Alias added: GHSA-gq3r-5833-5532
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-2025-36530 · CVE Program
- CVE-2025-36530 · NVD
- FIRST EPSS
- GHSA-gq3r-5833-5532 · 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