BookStack is vulnerable to Improper Access Control.
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | ssddanbrown/bookstack | < 21.11.3 | 21.11.3 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-4119
- https://github.com/bookstackapp/bookstack/commit/e765e618547c92f4e0b46caca6fb91f0174efd99
- https://github.com/BookStackApp/BookStack/releases/tag/v21.11.3
- https://github.com/bookstackapp/bookstack
- https://huntr.dev/bounties/135f2d7d-ab0b-4351-99b9-889efac46fca
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-284- Platform
- Composer
- Package
ssddanbrown/bookstack- Disclosed
- 16.12.2021
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-9c5c-5j4h-8q2c - CC BY 4.0
Vulnerability history: ssddanbrown/bookstack
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 10
- First → latest
- 03.2020 07.2024
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 4
- Medium 5
- Low 1
Disclosures per year
- 2020: 2
- 2021: 4
- 2022: 3
- 2023: 0
- 2024: 1
- 2025: 0
- 2026: 0
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BookStack is vulnerable to Improper Access Control. this entry
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