Client4 fails to validate path parameters
Priority LOW 24CWE-22Published · 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
The Mattermost Go module github.com/mattermost/mattermost/server/public versions < v0.1.22 fail to validate path parameters when constructing API route paths which allows an attacker to redirect API calls to unintended endpoints via crafted IDs containing path traversal components. Mattermost Advisory ID: MMSA-2025-00532
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00291 21st percentileScored 2026-11-07
Fix Fixed github.com/mattermost/mattermost/server/public (Mattermost): v0.1.22github.com/mattermost/mattermost/server/public (Go): 0.1.22
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 | github.com/mattermost/mattermost/server/public | v0.0.0 to before v0.1.22 | v0.1.22 | Patch available | CNA |
| — | github.com/mattermost/mattermost/server/public (Go) | before 0.1.22 | 0.1.22 | Patch available | GHSA-72v2-v53v-4qmm |
- github.com/mattermost/mattermost/server/public VendorMattermost Affected v0.0.0 to before v0.1.22 Fixed in v0.1.22 Patch available CNA
- github.com/mattermost/mattermost/server/public (Go) Vendor— Affected before 0.1.22 Fixed in 0.1.22 Patch available GHSA-72v2-v53v-4qmm
Remediation
- Fix · CNA github.com/mattermost/mattermost/server/public (Mattermost) Fixed in v0.1.22
- Fix · GHSA-72v2-v53v-4qmm github.com/mattermost/mattermost/server/public (Go) Fixed in 0.1.22 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-13426
- 2026-10-03 Alias added: GHSA-72v2-v53v-4qmm
- 2026-11-03 Fix available: Go/github.com/mattermost/mattermost/server/[email protected] · GHSA-72v2-v53v-4qmm
- 2026-11-03 CVSS score added · GHSA-72v2-v53v-4qmm
- 2026-11-03 Weakness changed · GHSA-72v2-v53v-4qmm
- 2026-11-03 8 new references · GHSA-72v2-v53v-4qmm
References
Other 6
- https://github.com/mattermost/mattermost/pull/34499
- https://github.com/mattermost/mattermost/pull/39305
- https://github.com/mattermost/mattermost/commit/2b075c9b74effbb56f3769f1bdec161eef4c6808
- https://github.com/mattermost/mattermost/commit/64c16ff0ea7f455ee648bfe906407def1274fbd3
- https://github.com/mattermost/mattermost
- https://github.com/mattermost/mattermost/releases/tag/server/public/v0.1.22
More Mattermost vulnerabilities
- TI-2025-18933 Arbitrary file read in Mattermost Boards via import & export board archive CVSS 3.1CRITICAL 9.9
- TI-2019-15071 An issue was discovered in Mattermost Packages before 5.16.3. CVSS 3.1CRITICAL 9.8
- TI-2025-04465 Path Traversal Leading to RCE by Any Authenticated Mattermost User CVSS 3.1CRITICAL 9.9
- TI-2019-15074 An issue was discovered in Mattermost Desktop App before 4.3.0 on macOS. CVSS 3.1CRITICAL 9.8
- 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
Sources
- CVE-2026-13426 · CVE Program
- CVE-2026-13426 · NVD
- FIRST EPSS
- GHSA-72v2-v53v-4qmm · 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