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Vulnerability record · CVE-2021-4119 · published 15 December 2021
CVE-2021-4119: Bookstackapp bookstack improper access control vulnerability
Bookstackapp · Bookstack
bookstack is vulnerable to Improper Access Control
9.8 CVSS 3.1 Critical EPSS 27% · top 2.0% CWE-284 · Improper access control
9.8CVSS 3.1 base score, v2 7.5
27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD
Description
bookstack is vulnerable to Improper Access Control
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.
References
| Link | Tags |
|---|---|
| https://github.com/bookstackapp/bookstack/commit/e765e618547c92f4e0b46caca6fb91f0174efd99 | PatchThird Party Advisory |
| https://huntr.dev/bounties/135f2d7d-ab0b-4351-99b9-889efac46fca | ExploitPatchThird Party Advisory |
| https://github.com/bookstackapp/bookstack/commit/e765e618547c92f4e0b46caca6fb91f0174efd99 | PatchThird Party Advisory |
| https://huntr.dev/bounties/135f2d7d-ab0b-4351-99b9-889efac46fca | ExploitPatchThird Party Advisory |
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Related vulnerabilities
Same products first, then exploited flaws of the same weakness class.
8.8CVE-2020-5256Bookstackapp bookstack unrestricted file upload vulnerabilityBookStack before version 0.25.5 has a vulnerability where a user could upload PHP files through image upload functions, which would allow them to exe…EPSS 2.0%8.7CVE-2020-26211Bookstackapp bookstack cross-site scripting vulnerabilityIn BookStack before version 0.30.4, a user with permissions to edit a page could insert JavaScript code through the use of `javascript:` URIs within …EPSS 1.1%8.7CVE-2020-26210Bookstackapp bookstack cross-site scripting vulnerabilityIn BookStack before version 0.30.4, a user with permissions to edit a page could add an attached link which would execute untrusted JavaScript code w…EPSS 1.2%6.8CVE-2021-3944Bookstackapp bookstack cross-site request forgery vulnerabilitybookstack is vulnerable to Cross-Site Request Forgery (CSRF)EPSS 0.64%6.5CVE-2023-6199Bookstackapp bookstack server-side request forgery (ssrf) vulnerabilityBook Stack version 23.10.2 allows filtering local files on the server. This is possible because the application is vulnerable to SSRF.EPSS 1.4%6.5CVE-2021-4194Bookstackapp bookstack improper access control vulnerabilitybookstack is vulnerable to Improper Access ControlEPSS 0.71%6.5CVE-2021-3916Bookstackapp bookstack path traversal vulnerabilitybookstack is vulnerable to Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')EPSS 1.2%6.5CVE-2021-3906Bookstackapp bookstack unrestricted file upload vulnerabilitybookstack is vulnerable to Unrestricted Upload of File with Dangerous TypeEPSS 0.67%
Source: NIST National Vulnerability Database (record CVE-2021-4119), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.
