{"id":"CVE-2021-3767","aliases":["EUVD-2021-27036","GHSA-6wjr-v5v8-r9w2"],"status":"published","title":"Cross-site Scripting (XSS) - Stored in bookstackapp/bookstack","description":"bookstack is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","severity":{"version":"3.0","score":5.4,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0058,"percentile":0.47982,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-09-06T11:17:17Z","modified":"2026-10-20T10:54:49Z","products":[{"vendor":"bookstackapp","product":"bookstack"},{"vendor":"bookstackapp","product":"bookstackapp/bookstack"}],"references":[{"url":"https://huntr.dev/bounties/7ec92c85-30eb-4071-8891-6183446ca980","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Issue Tracking","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/bookstackapp/bookstack/commit/040997fdc4414776bcac06a3cbaac3b26b5e8a64","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3767"},{"url":"https://github.com/advisories/GHSA-6wjr-v5v8-r9w2"}],"sources":{"cve":[{"id":"CVE-2021-3767","title":"Cross-site Scripting (XSS) - Stored in bookstackapp/bookstack","description":"bookstack is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","status":"published","published":"2021-09-06T11:17:17Z","modified":"2024-08-03T17:09:08.832Z","cvss":[{"version":"3.0","score":5.4,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:33:04.360272Z"}],"euvd":[{"id":"EUVD-2021-27036","description":"bookstack is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","status":"published","published":"2021-09-06T11:17:17Z","modified":"2024-08-03T17:09:08Z","cvss":[{"version":"3.0","score":5.4,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T03:25:11.953192Z"}],"ghsa":[{"id":"GHSA-6wjr-v5v8-r9w2","title":"bookstack is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross...","description":"bookstack is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","status":"published","published":"2022-05-24T19:13:03Z","modified":"2023-01-30T05:01:55Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:46:30.744651Z"}],"nvd":[{"id":"CVE-2021-3767","description":"bookstack is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","status":"published","published":"2021-09-06T12:15:08.237Z","modified":"2026-06-17T04:05:43.553Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"3.0","score":5.4,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:58.05696Z"}],"osv":[{"id":"CVE-2021-3767","description":"bookstack is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","status":"published","published":"2021-09-06T12:15:08.237Z","modified":"2026-10-20T10:54:49.875992874Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:20.434873Z"}]}}