Vulnerability · Published Dec 24, 2025 · Assigned by Mattermost
CVE-2025-13767Unauthorized Read Access to Private Channel Posts via Mattermost Jira Plugin
Medium 4.3
In plain English
A medium-severity incorrect authorization in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 11.0.6 | GHSA-fmqf-pmcm-8cx9 |
| Go | github.com/mattermost/mattermost-server | 10.11.8 | GHSA-fmqf-pmcm-8cx9 |
| Go | github.com/mattermost/mattermost-server | 10.12.4 | GHSA-fmqf-pmcm-8cx9 |
| Go | github.com/mattermost/mattermost-server | 11.1.1 | GHSA-fmqf-pmcm-8cx9 |
| Go | github.com/mattermost/mattermost-server | 10.11.8+incompatible, 10.12.4+incompatible, 11.0.6+incompatible, 11.1.1+incompatible | GO-2025-4259 |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-4259 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-4259 |
| Go | github.com/mattermost/mattermost/server/v8 | no fix listed | GO-2025-4259 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20251121122154-b57c297c6d7 | GHSA-fmqf-pmcm-8cx9 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 11.1.0 – through 11.1.011.0.0 – through 11.0.510.12.0 – through 10.12.310.11.0 – through 10.11.7 |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N