{"id":"CVE-2023-28357","aliases":["EUVD-2023-32055","GHSA-463w-cvvx-2q2c"],"status":"published","title":"A vulnerability has been identified in Rocket.Chat, where the ACL checks in the Slash Command ...","description":"A vulnerability has been identified in Rocket.Chat, where the ACL checks in the Slash Command /mute occur after checking whether a user is a member of a given channel, leaking private channel members to unauthorized users. This allows authenticated users to enumerate whether a username is a member of a channel that they do not have access to.","severity":{"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":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00412,"percentile":0.3595,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-200","CWE-863"],"published":"2023-05-11T00:00:00Z","modified":"2026-10-28T02:30:50Z","products":[{"vendor":"rocket.chat","product":"rocket.chat"}],"references":[{"url":"https://hackerone.com/reports/1445810","tags":["x_transferred","Issue Tracking","Third Party Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28357","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-463w-cvvx-2q2c"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/28xxx/CVE-2023-28357.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2023-28357","description":"A vulnerability has been identified in Rocket.Chat, where the ACL checks in the Slash Command /mute occur after checking whether a user is a member of a given channel, leaking private channel members to unauthorized users. This allows authenticated users to enumerate whether a username is a member of a channel that they do not have access to.","status":"published","published":"2023-05-11T00:00:00Z","modified":"2025-01-27T17:11:35.726Z","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":"adp"}],"cwes":["CWE-200","CWE-863"],"updated_at":"2026-11-02T14:35:32.752775Z"}],"euvd":[{"id":"EUVD-2023-32055","description":"A vulnerability has been identified in Rocket.Chat, where the ACL checks in the Slash Command /mute occur after checking whether a user is a member of a given channel, leaking private channel members to unauthorized users. This allows authenticated users to enumerate whether a username is a member of a channel that they do not have access to.","status":"published","published":"2023-05-11T00:00:00Z","modified":"2025-01-27T17:11:35Z","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":"2026-11-03T00:04:13.087176Z"}],"ghsa":[{"id":"GHSA-463w-cvvx-2q2c","title":"A vulnerability has been identified in Rocket.Chat, where the ACL checks in the Slash Command ...","description":"A vulnerability has been identified in Rocket.Chat, where the ACL checks in the Slash Command /mute occur after checking whether a user is a member of a given channel, leaking private channel members to unauthorized users. This allows authenticated users to enumerate whether a username is a member of a channel that they do not have access to.","status":"published","published":"2023-05-12T00:30:17Z","modified":"2025-01-27T18:31:56Z","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","CWE-863"],"updated_at":"2026-11-02T14:59:41.697715Z"}],"nvd":[{"id":"CVE-2023-28357","description":"A vulnerability has been identified in Rocket.Chat, where the ACL checks in the Slash Command /mute occur after checking whether a user is a member of a given channel, leaking private channel members to unauthorized users. This allows authenticated users to enumerate whether a username is a member of a channel that they do not have access to.","status":"published","published":"2023-05-11T22:15:09.94Z","modified":"2026-06-17T05:47:32.023Z","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":"primary"},{"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"}],"cwes":["CWE-200","CWE-863"],"updated_at":"2026-11-02T14:08:02.399327Z"}],"osv":[{"id":"CVE-2023-28357","description":"A vulnerability has been identified in Rocket.Chat, where the ACL checks in the Slash Command /mute occur after checking whether a user is a member of a given channel, leaking private channel members to unauthorized users. This allows authenticated users to enumerate whether a username is a member of a channel that they do not have access to.","status":"published","published":"2023-05-11T00:00:00Z","modified":"2026-10-28T02:30:50.614221377Z","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":"2026-11-02T15:44:31.468318Z"}]}}