CVE-2025-12689 json
DoS in Calls plugin via malformed UTF-8 in WebSocket request
published 2025-12-17 10 mo ago modified 2026-10-13 27 d ago also GHSA-j5vq-62gr-8v3r , GO-2025-4255 , EUVD-2025-203918
- cvss
- 6.5
- 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 21%
- public exploits
- 0
- none known
Summary
Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.
Patch / fix
- go github.com/mattermost/mattermost-plugin-calls 1.11.0
- Mattermost Mattermost 10.11.7, 10.12.3, 11.0.5, 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
- 10 mo ago
Exploit prediction
0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-plugin-calls | <1.11.0 |
1.11.0 |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-1287 Improper Validation of Specified Type of Input
References
-
github.com
/mattermost/mattermost-plugin-calls/commit/f68b41980e1274e05cf91c687e2af1a73c5e36ca
web, patch
-
mattermost.com
/security-updates
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-12689
advisory
-
github.com
/mattermost/mattermost
package
-
github.com
/advisories/GHSA-j5vq-62gr-8v3r
advisory
Sources
- CVE List CVE-2025-12689
- GitHub Advisory GHSA-j5vq-62gr-8v3r
- NVD CVE-2025-12689
- OSV GO-2025-4255
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