Improper Access Control in bookstackapp/bookstack
Priority MEDIUM 64CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-284.
Summary
bookstack is vulnerable to Improper Access Control
Why it matters now
EPSS 0.26893 98th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed bookstackapp/bookstack (bookstackapp): 21.11.3ssddanbrown/bookstack (Packagist): 21.11.3
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| bookstackapp | bookstackapp/bookstack | before 21.11.3 | 21.11.3 | Patch available | CNA |
| — | ssddanbrown/bookstack (Packagist) | before 21.11.3 | 21.11.3 | Patch available | GHSA-9c5c-5j4h-8q2c |
- bookstackapp/bookstack Vendorbookstackapp Affected before 21.11.3 Fixed in 21.11.3 Patch available CNA
- ssddanbrown/bookstack (Packagist) Vendor— Affected before 21.11.3 Fixed in 21.11.3 Patch available GHSA-9c5c-5j4h-8q2c
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:* | up to 21.11.2 | Vulnerable | bookstackapp |
- cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:* Versions up to 21.11.2 Vulnerable ·bookstackapp
Remediation
- Fix · CNA bookstackapp/bookstack (bookstackapp) Fixed in 21.11.3
- Fix · GHSA-9c5c-5j4h-8q2c ssddanbrown/bookstack (Packagist) Fixed in 21.11.3 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-4119
- 2026-10-03 Alias added: GHSA-9c5c-5j4h-8q2c
References
More bookstackapp Bookstack vulnerabilities
- TI-2023-04263 Server-Side Request Forgery (SSRF) in bookstackapp/bookstack CVSS 3.1LOW 2.4
- TI-2020-04312 Remote Code Execution Through Image Uploads in BookStack CVSS 3.1HIGH 8.8
- TI-2020-16032 Cross-Site Scripting in BookStack CVSS 3.1HIGH 8.7
- TI-2020-16031 Cross-Site Scripting in BookStack CVSS 3.1HIGH 8.7
- TI-2023-05693 Book Stack v23.10.2 - LFR via Blind SSRF CVSS 3.1MEDIUM 6.5
- TI-2021-02848 Cross-Site Request Forgery (CSRF) in bookstackapp/bookstack CVSS 3.1MEDIUM 6.8
Sources
- CVE-2021-4119 · CVE Program
- CVE-2021-4119 · NVD
- FIRST EPSS
- GHSA-9c5c-5j4h-8q2c · GitHub Advisory Database · CC BY 4.0
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