Mattermost Jira plugin crafted action leaks Jira issue details
Priority LOW 18CWE-863Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.
Summary
Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fail to verify that post actions invoking /share-issue-publicly were created by the Jira plugin which allowed a malicious Mattermost user to exfiltrate Jira tickets when victim users interacted with affected posts
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00175 6th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 11.2.0, 11.1.1, 11.0.6 +2github.com/mattermost/mattermost/server/v8 (Go): 8.0.0-20251121122154-b57c297c6d7+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 | 11.1.0 – 11.1.0; 11.0.0 – 11.0.5; 10.12.0 – 10.12.3; 10.11.0 – 10.11.7 | 11.2.0, 11.1.1, 11.0.6, 10.12.4, 10.11.8 | Patch available | CNA |
| — | github.com/mattermost/mattermost/server/v8 (Go) | before 8.0.0-20251121122154-b57c297c6d7 | 8.0.0-20251121122154-b57c297c6d7 | Patch available | GHSA-vww6-79rv-3j4x |
| — | github.com/mattermost/mattermost-server (Go) | 10.11.0 to before 10.11.8 | 10.11.8 | Patch available | GHSA-vww6-79rv-3j4x |
| — | github.com/mattermost/mattermost-server (Go) | 10.12.0 to before 10.12.4 | 10.12.4 | Patch available | GHSA-vww6-79rv-3j4x |
| — | github.com/mattermost/mattermost-server (Go) | 11.0.0 to before 11.0.6 | 11.0.6 | Patch available | GHSA-vww6-79rv-3j4x |
| — | github.com/mattermost/mattermost-server (Go) | 11.1.0 to before 11.1.1 | 11.1.1 | Patch available | GHSA-vww6-79rv-3j4x |
- Mattermost VendorMattermost Affected 11.1.0 – 11.1.0; 11.0.0 – 11.0.5; 10.12.0 – 10.12.3; 10.11.0 – 10.11.7 Fixed in 11.2.0, 11.1.1, 11.0.6, 10.12.4, 10.11.8 Patch available CNA
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20251121122154-b57c297c6d7 Fixed in 8.0.0-20251121122154-b57c297c6d7 Patch available GHSA-vww6-79rv-3j4x
- github.com/mattermost/mattermost-server (Go) Vendor— Affected 10.11.0 to before 10.11.8 Fixed in 10.11.8 Patch available GHSA-vww6-79rv-3j4x
- github.com/mattermost/mattermost-server (Go) Vendor— Affected 10.12.0 to before 10.12.4 Fixed in 10.12.4 Patch available GHSA-vww6-79rv-3j4x
- github.com/mattermost/mattermost-server (Go) Vendor— Affected 11.0.0 to before 11.0.6 Fixed in 11.0.6 Patch available GHSA-vww6-79rv-3j4x
- github.com/mattermost/mattermost-server (Go) Vendor— Affected 11.1.0 to before 11.1.1 Fixed in 11.1.1 Patch available GHSA-vww6-79rv-3j4x
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 10.11.0 to before 10.11.8; 10.12.0 to before 10.12.4; 11.0.0 to before 11.0.6; 11.1.0 to before 11.1.1 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 10.11.0 to before 10.11.8; 10.12.0 to before 10.12.4; 11.0.0 to before 11.0.6; 11.1.0 to before 11.1.1 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 11.2.0, 11.1.1, 11.0.6, 10.12.4, 10.11.8
- Fix · GHSA-vww6-79rv-3j4x github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20251121122154-b57c297c6d7 Advisory →
- Fix · GHSA-vww6-79rv-3j4x github.com/mattermost/mattermost-server (Go) Fixed in 10.11.8 Advisory →
- Fix · GHSA-vww6-79rv-3j4x github.com/mattermost/mattermost-server (Go) Fixed in 10.12.4 Advisory →
- Fix · GHSA-vww6-79rv-3j4x github.com/mattermost/mattermost-server (Go) Fixed in 11.0.6 Advisory →
- Fix · GHSA-vww6-79rv-3j4x github.com/mattermost/mattermost-server (Go) Fixed in 11.1.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-64641
- 2026-10-03 Alias added: GHSA-vww6-79rv-3j4x
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-2025-64641 · CVE Program
- CVE-2025-64641 · NVD
- FIRST EPSS
- GHSA-vww6-79rv-3j4x · 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