LOW 3.1 Go
Mattermost Incorrect Authorization vulnerability
GHSA-mqcj-8c2g-h97q · CVE-2025-11777 · GO-2025-4122
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Description
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API, which allows users from one team to access user metadata and channel membership information from other teams via the API endpoint.
References
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2025-11777
- WEB https://github.com/mattermost/mattermost/commit/98acefe911dd9de7edf47a7d825dd99f53141a52
- WEB https://github.com/mattermost/mattermost/commit/ba86dfc5876b354b9d3c20ff45c08ca6f8426149
- WEB https://github.com/mattermost/mattermost/commit/d72d437f1567ba0b639b6e4fd73bab06c51baab5
- PACKAGE https://github.com/mattermost/mattermost
- WEB https://mattermost.com/security-updates
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