CVE-2025-14350 json
Information disclosure via channel mentions in posts
published 8mo ago modified 4mo ago also GHSA-57cc-2pf4-mhmx , GO-2026-4521 , EUVD-2025-206980
- 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 8%
- public exploits
- 0
- none known
Summary
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the channel_mentions property in the API response. Mattermost Advisory ID: MMSA-2025-00563
Patch / fix
- go github.com/mattermost/mattermost/server/v8 8.0.0-20251209134645-761e56bb11cc
- go github.com/mattermost/mattermost-server 5.3.2-0.20251209134645-761e56bb11cc
- Mattermost Mattermost 10.11.10, 11.1.3, 11.2.2, 11.3.0
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260226T182644-150000.1.149.1
suse advisories SUSE-SU-2026:0757-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
Is CVE-2025-14350 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 8mo ago
Exploit prediction
0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-11).
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 | <8.0.0-20251209134645-761e56bb11cc |
8.0.0-20251209134645-761e56bb11cc |
| go | github.com/mattermost/mattermost-server | >=11.1.0 >=10.11.0 >=11.2.0 <5.3.2-0.20251209134645-761e56bb11cc all versions >=10.11.0+incompatible >=11.1.0+incompatible >=11.2.0+incompatible |
5.3.2-0.20251209134645-761e56bb11cc |
| 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-862 Missing Authorization
References
Sources
- CVE List CVE-2025-14350
- GitHub Advisory GHSA-57cc-2pf4-mhmx
- NVD CVE-2025-14350
- OSV GO-2026-4521
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