medium4.3
CVE-2025-14350
Mattermost fails to properly validate team membership when processing channel mentions
Impact
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the channel_mentions property in the API response. Mattermost Advisory ID: MMSA-2025-00563
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20251209134645-761e56bb11cc | 8.0.0-20251209134645-761e56bb11cc |
| go | github.com/mattermost/mattermost-server | >= 11.1.0, < 11.1.3 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mattermost | Mattermost Server | from 10.11.0 before 10.11.10 from 11.1.0 before 11.1.3 from 11.2.0 before 11.2.2 |