{"id":"CVE-2023-1775","aliases":["BIT-mattermost-2023-1775","GHSA-8jhh-3jf2-pfwr"],"url":"https://o3.security/vulnerability/CVE-2023-1775","summary":"Unsanitized events sent over Websocket to regular users in a High Availability environment","details":"When running in a High Availability configuration, Mattermost fails to sanitize some of the user_updated and post_deleted events broadcast to all users, leading to disclosure of sensitive information to some of the users with currently connected Websocket clients.\n\n\n","published":"2023-03-31T11:26:21.640Z","modified":"2026-08-12T03:51:36.018217346Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"},"epss":{"score":0.00546,"percentile":0.44495,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"7.1.6"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"7.7.2"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"7.1.6"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v5","fixedVersion":"7.1.6"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v6","fixedVersion":"7.1.6"}],"fix":null,"references":[{"type":"WEB","url":"https://mattermost.com/security-updates/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/1xxx/CVE-2023-1775.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-1775"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:36.018217346Z"}}