{"id":"GHSA-j5vq-62gr-8v3r","summary":"Mattermost fails to check Websocket request for proper UTF-8 format potentially crashing Calls plug-in","details":"Mattermost versions 11.0.x \u003c= 11.0.4, 10.12.x \u003c= 10.12.2, 10.11.x \u003c= 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.","aliases":["CVE-2025-12689","GO-2025-4255"],"modified":"2025-12-30T02:25:58.723545Z","published":"2025-12-17T21:30:48Z","database_specific":{"github_reviewed_at":"2025-12-20T17:13:53Z","nvd_published_at":"2025-12-17T19:16:00Z","cwe_ids":["CWE-1287"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-12689"},{"type":"WEB","url":"https://github.com/mattermost/mattermost-plugin-calls/commit/f68b41980e1274e05cf91c687e2af1a73c5e36ca"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"affected":[{"package":{"name":"github.com/mattermost/mattermost-plugin-calls","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-plugin-calls"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.11.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/12/GHSA-j5vq-62gr-8v3r/GHSA-j5vq-62gr-8v3r.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}