CVE-2025-12559
MEDIUM4.3EPSS 0.04%Mattermost fails to sanitize team email addresses
Published: 11/27/2025Modified: 12/15/2025
Description
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
Affected packages (6)
- Go/github.com/mattermost/mattermost-server>= 11.0.0, < 11.0.3
- Go/github.com/mattermost/mattermost-serverfrom 0
- Go/github.com/mattermost/mattermost-server/v5from 0
- Go/github.com/mattermost/mattermost-server/v6from 0
- Go/github.com/mattermost/mattermost/server/v8from 0, < 8.0.0-20251015091448-abbf01b9db45
- Go/github.com/mattermost/mattermost/server/v8from 0, < 8.0.0-20251015091448-abbf01b9db45
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
References (10)
- ADVISORYhttps://github.com/advisories/GHSA-4g87-9x45-cx2h
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-12559
- PATCHhttps://github.com/mattermost/mattermost
- WEBhttps://github.com/mattermost/mattermost/commit/5d8719042c1807da59ac8a821624eb01152d8495
- WEBhttps://github.com/mattermost/mattermost/commit/649aee8fa9184ca59bd66022a33b8f8918e413aa
- WEBhttps://github.com/mattermost/mattermost/commit/7ccb62db7958abd6a4b21a06c5a4f5367a8f8b1f
- WEBhttps://github.com/mattermost/mattermost/commit/9f54e5cdc3aef412945ff0e6a58338f7b549bdda
- WEBhttps://github.com/mattermost/mattermost/commit/abbf01b9db45d1850eaf3701ea8362b910193ffd
- WEBhttps://github.com/mattermost/mattermost/pull/34110
- WEBhttps://mattermost.com/security-updates