{"id":"CVE-2020-14457","aliases":["BIT-mattermost-2020-14457","GHSA-j2h2-cvwh-cr64","GO-2023-1939"],"url":"https://o3.security/vulnerability/CVE-2020-14457","summary":"Mattermost Server Sensitive Data Exposure","details":"An issue was discovered in Mattermost Server before 5.20.0. Non-members can receive broadcasted team details via the update_team WebSocket event, aka MMSA-2020-0012.","published":"2020-06-19T14:15:11.840Z","modified":"2026-07-08T16:27:06.686768Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v5","fixedVersion":"5.20.0"}],"fix":{"url":"https://github.com/mattermost/mattermost/pull/13848","label":"mattermost/mattermost#13848"},"references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-14457"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/pull/13848"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T16:27:06.686768Z"}}