CVE-2025-12559 json
Information Disclosure in Common Teams API
published 2025-11-27 11 mo ago modified 2026-10-19 21 d ago also GHSA-4g87-9x45-cx2h , GO-2025-4169 , EUVD-2025-199831
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 14%
- public exploits
- 0
- none known
Summary
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
Patch / fix
- go github.com/mattermost/mattermost/server/v8 8.0.0-20251015091448-abbf01b9db45
- go github.com/mattermost/mattermost-server 10.5.13, 10.11.5, 10.12.2, 11.0.3
- Mattermost Mattermost 10.5.13, 10.11.5, 10.12.2, 11.0.3, 11.1.0
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20251230T014957-150000.1.134.1
suse advisories SUSE-SU-2026:0037-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 11 mo ago
Exploit prediction
0.23% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| GitHub | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20251015091448-abbf01b9db45 |
8.0.0-20251015091448-abbf01b9db45 |
| go | github.com/mattermost/mattermost-server | >=11.0.0, <11.0.3 >=10.12.0, <10.12.2 >=10.11.0, <10.11.5 >=10.5.0, <10.5.13 all versions |
11.0.3 10.12.2 10.11.5 10.5.13 |
| go | github.com/mattermost/mattermost-server/v5 | all versions |
no fix listed |
| go | github.com/mattermost/mattermost-server/v6 | all versions |
no fix listed |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
-
github.com
/mattermost/mattermost/pull/34110
web
-
github.com
/mattermost/mattermost/commit/5d8719042c1807da59ac8a821624eb01152d8495
web
-
github.com
/mattermost/mattermost/commit/649aee8fa9184ca59bd66022a33b8f8918e413aa
web
-
github.com
/mattermost/mattermost/commit/7ccb62db7958abd6a4b21a06c5a4f5367a8f8b1f
web
-
github.com
/mattermost/mattermost/commit/9f54e5cdc3aef412945ff0e6a58338f7b549bdda
web
-
github.com
/mattermost/mattermost/commit/abbf01b9db45d1850eaf3701ea8362b910193ffd
web
-
mattermost.com
/security-updates
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-12559
advisory
-
github.com
/mattermost/mattermost
package
-
github.com
/advisories/GHSA-4g87-9x45-cx2h
advisory
Sources
- CVE List CVE-2025-12559
- GitHub Advisory GHSA-4g87-9x45-cx2h
- NVD CVE-2025-12559
- OSV GO-2025-4169
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.