CVE-2025-41443 json
Guest user can discover active public channels
published 2025-10-16 12 mo ago modified 2026-10-19 20 d ago also GHSA-7cr3-38jm-6p45 , GO-2025-4031 , EUVD-2025-34731
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 24%
- public exploits
- 0
- none known
Summary
Mattermost versions 10.5.x <= 10.5.12, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when accessing channel information which allows guest users to discover active public channels and their metadata via the `/api/v4/teams/{team_id}/channels/ids` endpoint
Patch / fix
- go github.com/mattermost/mattermost/server/v8 8.0.0-20250822090405-e8c7e7d0252b
- go github.com/mattermost/mattermost-server 10.5.11, 10.11.3
- Mattermost Mattermost 10.5.13, 10.11.3, 10.12.0
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
- govulncheck-vulndb openSUSE Tumbleweed 0.0.20251105T184115-1.1
opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2025:15710-1
- github.com/mattermost/mattermost@e8c7e7d commit
- github.com/mattermost/mattermost#31327 pull request
- github.com/mattermost/mattermost#33778 pull request
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 12 mo ago
Exploit prediction
0.31% chance of exploitation in the next 30 days, higher than 24% 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 | <8.0.0-20250822090405-e8c7e7d0252b |
8.0.0-20250822090405-e8c7e7d0252b |
| go | github.com/mattermost/mattermost-server | >=10.5.0, <10.5.11 >=10.11.0, <10.11.3 all versions |
10.5.11 10.11.3 |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
github.com
/mattermost/mattermost/pull/31327
web
-
github.com
/mattermost/mattermost/pull/33778
web
-
github.com
/mattermost/mattermost/commit/e8c7e7d0252bbf1e098aae4a5ea05d945afd7e70
web
-
mattermost.com
/security-updates
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-41443
advisory
-
github.com
/mattermost/mattermost
package
Sources
- CVE List CVE-2025-41443
- GitHub Advisory GHSA-7cr3-38jm-6p45
- NVD CVE-2025-41443
- OSV GO-2025-4031
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.