{"id":"CVE-2021-4119","aliases":["EUVD-2021-2494","GHSA-9c5c-5j4h-8q2c"],"status":"published","title":"Improper Access Control in bookstackapp/bookstack","description":"bookstack is vulnerable to Improper Access Control","severity":{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.26893,"percentile":0.98049,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-284"],"published":"2021-12-15T17:25:10Z","modified":"2026-10-20T10:53:56Z","fixes":[{"ecosystem":"Packagist","package":"ssddanbrown/bookstack","fixed_in":["21.11.3"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"ssddanbrown/bookstack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"21.11.3"}]}]},{"source":"osv","ecosystem":"Packagist","package":"ssddanbrown/bookstack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"21.11.3"}]}],"versions":["0.7.2","V0.7.5","v0.10.0","v0.11.0","v0.11.1","v0.11.2","v0.12.0","v0.12.1","v0.12.2","v0.13.0","v0.13.1","v0.14.0","v0.14.1","v0.14.2","v0.14.3","v0.15.0","v0.15.1","v0.15.2","v0.15.3","v0.16.0","v0.16.1","v0.16.2","v0.16.3","v0.17.0","v0.17.1","v0.17.2","v0.17.3","v0.17.4","v0.18.0","v0.18.1","v0.18.2","v0.18.3","v0.18.4","v0.18.5","v0.19.0","v0.20.0","v0.20.1","v0.20.2","v0.20.3","v0.21.0","v0.22.0","v0.23.0","v0.23.1","v0.23.2","v0.24.0","v0.24.1","v0.24.2","v0.24.3","v0.25.0","v0.25.1","v0.25.2","v0.25.3","v0.25.4","v0.25.5","v0.26.0","v0.26.1","v0.26.2","v0.26.3","v0.26.4","v0.27","v0.27.1","v0.27.2","v0.27.3","v0.27.4","v0.27.5","v0.28.0","v0.28.1","v0.28.2","v0.28.3","v0.29.0","v0.29.1","v0.29.2","v0.29.3","v0.30.0","v0.30.1","v0.30.2","v0.30.3","v0.30.4","v0.30.5","v0.30.6","v0.30.7","v0.31.0","v0.31.1","v0.31.2","v0.31.3","v0.31.4","v0.31.5","v0.31.6","v0.31.7","v0.31.8","v0.5.0","v0.6.0","v0.6.1","v0.6.2","v0.6.3","v0.7.0","v0.7.3","v0.7.4","v0.7.6","v0.8.0","v0.8.1","v0.8.2","v0.9.0","v0.9.1","v0.9.2","v0.9.3","v21.04","v21.04.1","v21.04.2","v21.04.3","v21.04.4","v21.04.5","v21.04.6","v21.05","v21.05.1","v21.05.2","v21.05.3","v21.05.4","v21.08","v21.08.1","v21.08.2","v21.08.3","v21.08.4","v21.08.5","v21.08.6","v21.10","v21.10.1","v21.10.2","v21.10.3","v21.11","v21.11.1","v21.11.2"]}],"products":[{"vendor":"bookstackapp","product":"bookstack"},{"vendor":"bookstackapp","product":"bookstackapp/bookstack"}],"references":[{"url":"https://huntr.dev/bounties/135f2d7d-ab0b-4351-99b9-889efac46fca","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/bookstackapp/bookstack/commit/e765e618547c92f4e0b46caca6fb91f0174efd99","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-4119","tags":["advisory"]},{"url":"https://github.com/BookStackApp/BookStack/releases/tag/v21.11.3","tags":["web"]},{"url":"https://github.com/advisories/GHSA-9c5c-5j4h-8q2c"},{"url":"https://github.com/bookstackapp/bookstack","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-4119","title":"Improper Access Control in bookstackapp/bookstack","description":"bookstack is vulnerable to Improper Access Control","status":"published","published":"2021-12-15T17:25:10Z","modified":"2024-08-03T17:16:04.251Z","cvss":[{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:33:08.045407Z"}],"euvd":[{"id":"EUVD-2021-2494","description":"bookstack is vulnerable to Improper Access Control","status":"published","published":"2021-12-15T17:25:10Z","modified":"2024-08-03T17:16:04Z","cvss":[{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-03T03:25:10.888157Z"}],"ghsa":[{"id":"GHSA-9c5c-5j4h-8q2c","title":"BookStack is vulnerable to Improper Access Control.","description":"BookStack prior to version 21.11.3 is vulnerable to Improper Access Control. A logged-in user with no privileges OR guest user (if public access enabled) can access the /search/users/select AJAX endpoint meant for admins to manage audit logs, to dump all usernames existing in the Bookstack database. This can also be used to harvest email belonging to a user because BookStack also uses the code where(`email`, `like`, `%` . $search . `%`) to search for users based on email.","status":"published","published":"2021-12-16T19:40:26Z","modified":"2023-01-30T05:02:58Z","cvss":[{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:36:28.424013Z"}],"nvd":[{"id":"CVE-2021-4119","description":"bookstack is vulnerable to Improper Access Control","status":"published","published":"2021-12-15T20:15:08.837Z","modified":"2026-06-17T04:19:03.92Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:07:02.566991Z"}],"osv":[{"id":"CVE-2021-4119","description":"bookstack is vulnerable to Improper Access Control","status":"published","published":"2021-12-15T20:15:08.837Z","modified":"2026-10-20T10:53:56.799670765Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:21.249056Z"},{"id":"GHSA-9c5c-5j4h-8q2c","title":"BookStack is vulnerable to Improper Access Control.","description":"BookStack prior to version 21.11.3 is vulnerable to Improper Access Control. A logged-in user with no privileges OR guest user (if public access enabled) can access the /search/users/select AJAX endpoint meant for admins to manage audit logs, to dump all usernames existing in the Bookstack database. This can also be used to harvest email belonging to a user because BookStack also uses the code where(`email`, `like`, `%` . $search . `%`) to search for users based on email.","status":"published","published":"2021-12-16T19:40:26Z","modified":"2023-11-08T04:06:54.283602Z","cvss":[{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T15:46:43.524801Z"}]}}