Moderate severityNVD Advisory· Published Nov 27, 2025· Updated Nov 28, 2025
Information Disclosure in Common Teams API
CVE-2025-12559
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
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/mattermost/mattermost/server/v8Go | < 8.0.0-20251015091448-abbf01b9db45 | 8.0.0-20251015091448-abbf01b9db45 |
github.com/mattermost/mattermost-serverGo | >= 11.0.0, < 11.0.3 | 11.0.3 |
github.com/mattermost/mattermost-serverGo | >= 10.12.0, < 10.12.2 | 10.12.2 |
github.com/mattermost/mattermost-serverGo | >= 10.11.0, < 10.11.5 | 10.11.5 |
github.com/mattermost/mattermost-serverGo | >= 10.5.0, < 10.5.13 | 10.5.13 |
Affected products
4- ghsa-coords3 versionspkg:golang/github.com/mattermost/mattermost-serverpkg:golang/github.com/mattermost/mattermost/server/v8pkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2015.6
>= 11.0.0, < 11.0.3+ 2 more
- (no CPE)range: >= 11.0.0, < 11.0.3
- (no CPE)range: < 8.0.0-20251015091448-abbf01b9db45
- (no CPE)range: < 0.0.20251230T014957-150000.1.134.1
- Range: 11.0.0
Patches
Vulnerability mechanics
References
9- github.com/advisories/GHSA-4g87-9x45-cx2hghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-12559ghsaADVISORY
- github.com/mattermost/mattermost/commit/5d8719042c1807da59ac8a821624eb01152d8495ghsaWEB
- github.com/mattermost/mattermost/commit/649aee8fa9184ca59bd66022a33b8f8918e413aaghsaWEB
- github.com/mattermost/mattermost/commit/7ccb62db7958abd6a4b21a06c5a4f5367a8f8b1fghsaWEB
- github.com/mattermost/mattermost/commit/9f54e5cdc3aef412945ff0e6a58338f7b549bddaghsaWEB
- github.com/mattermost/mattermost/commit/abbf01b9db45d1850eaf3701ea8362b910193ffdghsaWEB
- github.com/mattermost/mattermost/pull/34110ghsaWEB
- mattermost.com/security-updatesghsaWEB
News mentions
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