CVE-2025-12559: Mattermost fails to sanitize team email addresses
(updated )
Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to sanitize team email addresses to be visible only to Team Admins, which allows any authenticated user to view team email addresses via the GET /api/v4/channels/{channel_id}/common_teams endpoint
References
- github.com/advisories/GHSA-4g87-9x45-cx2h
- github.com/mattermost/mattermost
- github.com/mattermost/mattermost/commit/5d8719042c1807da59ac8a821624eb01152d8495
- github.com/mattermost/mattermost/commit/649aee8fa9184ca59bd66022a33b8f8918e413aa
- github.com/mattermost/mattermost/commit/7ccb62db7958abd6a4b21a06c5a4f5367a8f8b1f
- github.com/mattermost/mattermost/commit/9f54e5cdc3aef412945ff0e6a58338f7b549bdda
- github.com/mattermost/mattermost/commit/abbf01b9db45d1850eaf3701ea8362b910193ffd
- github.com/mattermost/mattermost/pull/34110
- mattermost.com/security-updates
- nvd.nist.gov/vuln/detail/CVE-2025-12559
Code Behaviors & Features
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