{"id":"CVE-2021-3967","aliases":["EUVD-2021-27172","GHSA-2xp9-33rm-wcwv"],"status":"published","title":"Improper Access Control in zulip/zulip","description":"Improper Access Control in GitHub repository zulip/zulip prior to 4.10.","severity":{"version":"3.0","score":4.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00838,"percentile":0.58034,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-284","CWE-287"],"published":"2022-02-26T23:00:10Z","modified":"2026-10-24T10:51:25Z","products":[{"vendor":"zulip","product":"zulip"},{"vendor":"zulip","product":"zulip/zulip"}],"references":[{"url":"https://huntr.dev/bounties/2928a625-0467-4a0a-b4e2-e27322786686","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://github.com/zulip/zulip/commit/d5db254ca8167995a1654d1c45ffc74b2fade39a","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3967"},{"url":"https://github.com/advisories/GHSA-2xp9-33rm-wcwv"}],"sources":{"cve":[{"id":"CVE-2021-3967","title":"Improper Access Control in zulip/zulip","description":"Improper Access Control in GitHub repository zulip/zulip prior to 4.10.","status":"published","published":"2022-02-26T23:00:10Z","modified":"2024-08-03T17:09:09.862Z","cvss":[{"version":"3.0","score":4.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-27172","description":"Improper Access Control in GitHub repository zulip/zulip prior to 4.10.","status":"published","published":"2022-02-26T23:00:10Z","modified":"2024-08-03T17:09:09Z","cvss":[{"version":"3.0","score":4.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-03T03:25:11.376657Z"}],"ghsa":[{"id":"GHSA-2xp9-33rm-wcwv","title":"Improper Access Control in GitHub repository zulip/zulip prior to 4.10.","description":"Improper Access Control in GitHub repository zulip/zulip prior to 4.10.","status":"published","published":"2022-02-28T00:00:35Z","modified":"2023-01-27T05:03:07Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:42:10.172069Z"}],"nvd":[{"id":"CVE-2021-3967","description":"Improper Access Control in GitHub repository zulip/zulip prior to 4.10.","status":"published","published":"2022-02-26T23:15:08.83Z","modified":"2026-06-17T04:06:18.32Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"3.0","score":4.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"secondary"},{"version":"2.0","score":6.5,"vector":"AV:N/AC:L/Au:S/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:07:05.198719Z"}],"osv":[{"id":"CVE-2021-3967","description":"Improper Access Control in GitHub repository zulip/zulip prior to 4.10.","status":"published","published":"2022-02-26T23:15:08.83Z","modified":"2026-10-24T10:51:25.38362114Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:20.843843Z"}]}}