CVE-2025-13767
Medium
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.
SeverityMedium
CVSS4.3
Exploit probability—
Product
Mattermost Server
PublishedDec 24, 2025
First seenDec 24, 2025
Weakness typeCWE-863Incorrect authorization
How to fix
Update
- mattermost mattermost_server10.11.8, 10.12.4, 11.0.6, 11.1.1 or later
- github.com/mattermost/mattermost/server/v88.0.0-20251121122154-b57c297c6d7 or later
- github.com/mattermost/mattermost-server10.11.8, 10.12.4, 11.0.6, 11.1.1, 10.11.8+incompatible, 10.12.4+incompatible, 11.0.6+incompatible, 11.1.1+incompatible or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | 10.11.0 ≤ v < 10.11.8, 10.12.0 ≤ v < 10.12.4, 11.0.0 ≤ v < 11.0.6, 11.1.0 ≤ v < 11.1.1 | 10.11.8, 10.12.4, 11.0.6, 11.1.1 |
| github.com/mattermost/mattermost/server/v8Go | v < 8.0.0-20251121122154-b57c297c6d7, No range specified | 8.0.0-20251121122154-b57c297c6d7 |
| github.com/mattermost/mattermost-serverGo | 10.11.0 ≤ v < 10.11.8, 10.12.0 ≤ v < 10.12.4, 11.0.0 ≤ v < 11.0.6, 11.1.0 ≤ v < 11.1.1, 10.11.0+incompatible ≤ v < 10.11.8+incompatible, 10.12.0+incompatible ≤ v < 10.12.4+incompatible, 11.0.1+incompatible ≤ v < 11.0.6+incompatible, 11.1.0+incompatible ≤ v < 11.1.1+incompatible | 10.11.8, 10.12.4, 11.0.6, 11.1.1, 10.11.8+incompatible, 10.12.4+incompatible, 11.0.6+incompatible, 11.1.1+incompatible |
| github.com/mattermost/mattermost-server/v5Go | No range specified | — |
| github.com/mattermost/mattermost-server/v6Go | No range specified | — |
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