CVE-2025-2527 json
Improper access control to group information
published 2025-05-15 17 mo ago modified 2026-06-17 4 mo ago also GHSA-h356-3mfw-x368 , GO-2025-3691 , EUVD-2025-15177
- 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 <= 10.5.2, 9.11.x <= 9.11.11 failed to properly verify a user's permissions when accessing groups, which allows an attacker to view group information via an API request.
Patch / fix
- go github.com/mattermost/mattermost/server/v8 8.0.0-20250411064244-844447fbd57c, 9.11.12, 10.5.3
- go github.com/mattermost/mattermost-server 9.11.12+incompatible, 10.5.3+incompatible
- Mattermost Mattermost 9.11.12, 10.5.3, 10.7.0
- govulncheck-vulndb openSUSE Tumbleweed 0.0.20250523T151856-1.1
opensuse advisories openSUSE-SU-2025:15159-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 17 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 | >=10.5.0, <10.5.3 >=9.11.0, <9.11.12 <8.0.0-20250411064244-844447fbd57c |
10.5.3 9.11.12 8.0.0-20250411064244-844447fbd57c |
| go | github.com/mattermost/mattermost-server | >=9.11.0+incompatible, <9.11.12+incompatible >=10.5.0+incompatible, <10.5.3+incompatible |
9.11.12+incompatible 10.5.3+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
-
mattermost.com
/security-updates
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-2527
advisory
-
github.com
/mattermost/mattermost
package
-
github.com
/advisories/GHSA-h356-3mfw-x368
advisory
Sources
- CVE List CVE-2025-2527
- GitHub Advisory GHSA-h356-3mfw-x368
- NVD CVE-2025-2527
- OSV GO-2025-3691
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.