{"id":"GHSA-j2h2-cvwh-cr64","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.","aliases":["BIT-mattermost-2020-14457","CVE-2020-14457","GO-2023-1939"],"modified":"2025-08-14T21:22:40Z","published":"2022-05-24T17:21:17Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2023-07-18T13:40:24Z","nvd_published_at":"2020-06-19T14:15:00Z","cwe_ids":["CWE-862"],"severity":"MODERATE"},"references":[{"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"}],"affected":[{"package":{"name":"github.com/mattermost/mattermost-server/v5","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server/v5"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.20.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-j2h2-cvwh-cr64/GHSA-j2h2-cvwh-cr64.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}