{"cve":"CVE-2025-12689","nvd":{"published":"2025-12-17T19:16:00.537","modified":"2026-10-13T11:10:00.203","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-1287"],"references":["https://mattermost.com/security-updates"],"products":["mattermost:mattermost_server"],"source":"nvd","synced_at":"2026-10-19T22:17:07.138532058+00:00"},"epss":{"cve":"CVE-2025-12689","score":0.00288,"percentile":0.21116,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-j5vq-62gr-8v3r","url":"https://osv.dev/vulnerability/GHSA-j5vq-62gr-8v3r","summary":"Mattermost fails to check Websocket request for proper UTF-8 format potentially crashing Calls plug-in","modified":"2025-12-30T02:26:11.341605Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-plugin-calls","purl":"pkg:golang/github.com/mattermost/mattermost-plugin-calls","ranges":["<1.11.0"],"fixed":["1.11.0"]}]},{"id":"GO-2025-4255","url":"https://osv.dev/vulnerability/GO-2025-4255","summary":"Mattermost fails to check Websocket request for proper UTF-8 format potentially crashing Calls plug-in in github.com/mattermost/mattermost-plugin-calls","modified":"2026-03-03T04:57:49.044351Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-plugin-calls","purl":"pkg:golang/github.com/mattermost/mattermost-plugin-calls","ranges":["<1.11.0"],"fixed":["1.11.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}