{"id":"CVE-2023-1775","aliases":["BIT-mattermost-2023-1775","EUVD-2023-0949","GHSA-8jhh-3jf2-pfwr"],"status":"published","title":"Unsanitized events sent over Websocket to regular users in a High Availability environment","description":"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 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Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-1775","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-8jhh-3jf2-pfwr"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/1xxx/CVE-2023-1775.json","tags":["advisory"]},{"url":"https://github.com.mattermost/mattermost-server","tags":["package"]},{"url":"https://mattermost.com/security-updates","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2023-1775","title":"Unsanitized events sent over Websocket to regular users in a High Availability environment","description":"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","status":"published","published":"2023-03-31T11:26:21.64Z","modified":"2024-12-06T23:05:41.615Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:35:31.657022Z"}],"euvd":[{"id":"EUVD-2023-0949","description":"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","status":"published","published":"2023-03-31T11:26:21Z","modified":"2024-12-06T23:05:41Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-03T00:04:38.652605Z"}],"ghsa":[{"id":"GHSA-8jhh-3jf2-pfwr","title":"Mattermost vulnerable to information disclosure ","description":"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[Issue Identifier](https://mattermost.com/security-updates/): MMSA-2023-00138","status":"published","published":"2023-03-31T12:30:16Z","modified":"2023-04-07T21:23:37Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-668"],"updated_at":"2026-11-02T14:36:50.476488Z"}],"nvd":[{"id":"CVE-2023-1775","description":"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","status":"published","published":"2023-03-31T12:15:06.7Z","modified":"2026-06-17T05:28:43.9Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200","CWE-668"],"updated_at":"2026-11-02T14:07:51.883939Z"}],"osv":[{"id":"CVE-2023-1775","title":"Unsanitized events sent over Websocket to regular users in a High Availability environment","description":"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","status":"published","published":"2023-03-31T11:26:21.64Z","modified":"2026-10-28T02:30:42.11693775Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T15:44:30.334753Z"},{"id":"GHSA-8jhh-3jf2-pfwr","title":"Mattermost vulnerable to information disclosure ","description":"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[Issue Identifier](https://mattermost.com/security-updates/): MMSA-2023-00138","status":"published","published":"2023-03-31T12:30:16Z","modified":"2023-12-06T01:02:47.904466Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-668"],"updated_at":"2026-11-02T15:46:42.437513Z"},{"id":"BIT-mattermost-2023-1775","description":"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.","status":"published","published":"2024-03-06T11:02:33.383Z","modified":"2025-04-03T14:40:37.652Z","updated_at":"2026-11-02T15:28:33.072289Z"}]}}