Data exfiltration via AI plugin Jira tool
Priority LOW 29CWE-1426Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- 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 · NVD. Fix status from CNA and GitHub. Impact type from CWE-201.
Summary
Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.9 fail to restrict domains the LLM can request to contact upstream which allows an authenticated user to exfiltrate data from an arbitrary server accessible to the victim via performing a prompt injection in the AI plugin's Jira tool.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00288 21st percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 10.6.0, 10.4.3, 10.5.1 +1github.com/mattermost/mattermost/server/v8 (Go): 10.5.1, 10.4.3, 9.11.10 +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 | 10.4.0 – 10.4.2; 10.5.0; 9.11.0 – 9.11.9 | 10.6.0, 10.4.3, 10.5.1, 9.11.10 | Patch available | CNA |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 10.5.0 to before 10.5.1 | 10.5.1 | Patch available | GHSA-9h6j-4ffx-cm84 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 10.4.0 to before 10.4.3 | 10.4.3 | Patch available | GHSA-9h6j-4ffx-cm84 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.11.0 to before 9.11.10 | 9.11.10 | Patch available | GHSA-9h6j-4ffx-cm84 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | before 8.0.0-20250218121836-2b5275d87136 | 8.0.0-20250218121836-2b5275d87136 | Patch available | GHSA-9h6j-4ffx-cm84 |
- Mattermost VendorMattermost Affected 10.4.0 – 10.4.2; 10.5.0; 9.11.0 – 9.11.9 Fixed in 10.6.0, 10.4.3, 10.5.1, 9.11.10 Patch available CNA
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.5.0 to before 10.5.1 Fixed in 10.5.1 Patch available GHSA-9h6j-4ffx-cm84
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.4.0 to before 10.4.3 Fixed in 10.4.3 Patch available GHSA-9h6j-4ffx-cm84
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.11.0 to before 9.11.10 Fixed in 9.11.10 Patch available GHSA-9h6j-4ffx-cm84
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20250218121836-2b5275d87136 Fixed in 8.0.0-20250218121836-2b5275d87136 Patch available GHSA-9h6j-4ffx-cm84
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 9.11.0 to before 9.11.10; 10.4.0 to before 10.4.3 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:10.5.0:-:*:*:*:*:*:* | 10.5.0 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.11.0 to before 9.11.10; 10.4.0 to before 10.4.3 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:10.5.0:-:*:*:*:*:*:* Versions 10.5.0 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 10.6.0, 10.4.3, 10.5.1, 9.11.10
- Fix · GHSA-9h6j-4ffx-cm84 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.5.1 Advisory →
- Fix · GHSA-9h6j-4ffx-cm84 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.4.3 Advisory →
- Fix · GHSA-9h6j-4ffx-cm84 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.11.10 Advisory →
- Fix · GHSA-9h6j-4ffx-cm84 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250218121836-2b5275d87136 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-31363
- 2026-10-03 Alias added: GHSA-9h6j-4ffx-cm84
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-2025-31363 · CVE Program
- CVE-2025-31363 · NVD
- FIRST EPSS
- GHSA-9h6j-4ffx-cm84 · 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