medium4.3
CVE-2025-13767
Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues
Impact
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 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20251121122154-b57c297c6d7 | 8.0.0-20251121122154-b57c297c6d7 |
| go | github.com/mattermost/mattermost-server | >= 10.11.0, < 10.11.8 | 10.11.8 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mattermost | Mattermost Server | from 10.11.0 before 10.11.8 from 10.12.0 before 10.12.4 from 11.0.0 before 11.0.6 from 11.1.0 before 11.1.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://mattermost.com/security-updates
- https://github.com/advisories/GHSA-fmqf-pmcm-8cx9
- https://nvd.nist.gov/vuln/detail/CVE-2025-13767
- https://github.com/mattermost/mattermost/pull/34551
- https://github.com/mattermost/mattermost/commit/b57c297c6d7ae6812d85e32a625806ac9555deee
- https://pkg.go.dev/vuln/GO-2026-4259