{"id":"CVE-2021-3906","aliases":["EUVD-2021-27134","GHSA-qrmv-xr2h-3hrw"],"status":"published","title":"Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack","description":"bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type","severity":{"version":"3.0","score":5.4,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00668,"percentile":0.5218,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-434"],"published":"2021-10-27T21:20:10Z","modified":"2026-10-20T10:54:52Z","products":[{"vendor":"bookstackapp","product":"bookstack"},{"vendor":"bookstackapp","product":"bookstackapp/bookstack"}],"references":[{"url":"https://huntr.dev/bounties/f115bdf5-c06b-4627-a6fa-ba6904a43ba3","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Issue Tracking","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/bookstackapp/bookstack/commit/64937ab826b56d086af9ecea532510d37520ebc8","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3906"},{"url":"https://github.com/advisories/GHSA-qrmv-xr2h-3hrw"}],"sources":{"cve":[{"id":"CVE-2021-3906","title":"Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack","description":"bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type","status":"published","published":"2021-10-27T21:20:10Z","modified":"2024-08-03T17:09:09.761Z","cvss":[{"version":"3.0","score":5.4,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-27134","description":"bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type","status":"published","published":"2021-10-27T21:20:10Z","modified":"2024-08-03T17:09:09Z","cvss":[{"version":"3.0","score":5.4,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T03:25:11.376657Z"}],"ghsa":[{"id":"GHSA-qrmv-xr2h-3hrw","title":"bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type","description":"bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type","status":"published","published":"2022-05-24T19:19:11Z","modified":"2023-01-30T05:03:29Z","cwes":["CWE-434"],"updated_at":"2026-11-02T14:46:50.963031Z"}],"nvd":[{"id":"CVE-2021-3906","description":"bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type","status":"published","published":"2021-10-27T22:15:07.817Z","modified":"2026-06-17T04:05:58.017Z","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","assessor":"primary"},{"version":"3.0","score":5.4,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T14:07:00.549994Z"}],"osv":[{"id":"CVE-2021-3906","description":"bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type","status":"published","published":"2021-10-27T22:15:07.817Z","modified":"2026-10-20T10:54:52.735197998Z","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"}],"updated_at":"2026-11-02T15:44:20.843843Z"}]}}