CVE-2025-14350
Medium
Description
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
SeverityMedium
CVSS4.3
Exploit probability—
Product
Mattermost Server
PublishedFeb 16, 2026
First seenFeb 16, 2026
Weakness typeCWE-862Missing authorization
How to fix
Update
- mattermost mattermost_server10.11.10, 11.1.3, 11.2.2 or later
- github.com/mattermost/mattermost/server/v88.0.0-20251209134645-761e56bb11cc or later
- github.com/mattermost/mattermost-server5.3.2-0.20251209134645-761e56bb11cc or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | 10.11.0 ≤ v < 10.11.10, 11.1.0 ≤ v < 11.1.3, 11.2.0 ≤ v < 11.2.2 | 10.11.10, 11.1.3, 11.2.2 |
| github.com/mattermost/mattermost/server/v8Go | v < 8.0.0-20251209134645-761e56bb11cc | 8.0.0-20251209134645-761e56bb11cc |
| github.com/mattermost/mattermost-serverGo | 11.1.0 ≤ v, 10.11.0 ≤ v, 11.2.0 ≤ v, v < 5.3.2-0.20251209134645-761e56bb11cc, No range specified, 10.11.0+incompatible ≤ v, 11.1.0+incompatible ≤ v, 11.2.0+incompatible ≤ v | 5.3.2-0.20251209134645-761e56bb11cc |
| github.com/mattermost/mattermost-server/v5Go | No range specified | — |
| github.com/mattermost/mattermost-server/v6Go | No range specified | — |
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