CVE-2025-4128 json
Mattermost Guest User Information Disclosure Vulnerability
published 2025-06-11 16 mo ago modified 2026-06-17 4 mo ago also GHSA-jwhw-xf5v-qgxc , GO-2025-3757 , EUVD-2025-18094
- cvss
- 3.1
- 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 10.5.x <= 10.5.4, 9.11.x <= 9.11.13 fail to properly restrict API access to team information, allowing guest users to bypass permissions and view information about public teams they are not members of via a direct API call to /api/v4/teams/{team_id}.
Patch / fix
- go github.com/mattermost/mattermost/server/v8 8.0.0-20250422131222-701ddc896a10
- go github.com/mattermost/mattermost-server 9.11.14, 9.11.14+incompatible, 10.5.5, 10.5.5+incompatible
- Mattermost Mattermost 9.11.14, 10.5.5, 10.8.0
- govulncheck-vulndb openSUSE Tumbleweed 0.0.20250612T141001-1.1
opensuse advisories openSUSE-SU-2025:15225-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 16 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 | 3.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N |
| NVD | 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 | 3.1 | CVSS:3.1/AV:N/AC:H/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 | <8.0.0-20250422131222-701ddc896a10 |
8.0.0-20250422131222-701ddc896a10 |
| go | github.com/mattermost/mattermost-server | >=10.5.0, <10.5.5 >=9.11.0, <9.11.14 >=9.11.0+incompatible, <9.11.14+incompatible >=10.5.0+incompatible, <10.5.5+incompatible |
10.5.5 9.11.14 9.11.14+incompatible 10.5.5+incompatible |
| 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-863 Incorrect Authorization
References
-
github.com
/mattermost/mattermost/commit/2138a5f2ca6f75e2b99f6a04ea569d0f680c4fab
web
-
github.com
/mattermost/mattermost/commit/701ddc896a107b13f457fbdbe229bce5019fc516
web
-
mattermost.com
/security-updates
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-4128
advisory
-
github.com
/mattermost/mattermost
package
-
github.com
/advisories/GHSA-jwhw-xf5v-qgxc
advisory
Sources
- CVE List CVE-2025-4128
- GitHub Advisory GHSA-jwhw-xf5v-qgxc
- NVD CVE-2025-4128
- OSV GO-2025-3757
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.