Improper Access Control in bookstackapp/bookstack
Priority LOW 22CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- 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 0.00926 60th percentileScored 2026-11-08
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed bookstackapp/bookstack (bookstackapp): 21.11.2ssddanbrown/bookstack (Packagist): 21.11.2
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 21.11.2 | 21.11.2 | Patch available | CNA |
| — | ssddanbrown/bookstack (Packagist) | before 21.11.2 | 21.11.2 | Patch available | GHSA-jm6p-wfjg-xm7x |
- bookstackapp/bookstack Vendorbookstackapp Affected before 21.11.2 Fixed in 21.11.2 Patch available CNA
- ssddanbrown/bookstack (Packagist) Vendor— Affected before 21.11.2 Fixed in 21.11.2 Patch available GHSA-jm6p-wfjg-xm7x
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:* | before 21.11.2 | Vulnerable | bookstackapp |
- cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:* Versions before 21.11.2 Vulnerable ·bookstackapp
Remediation
- Fix · CNA bookstackapp/bookstack (bookstackapp) Fixed in 21.11.2
- Fix · GHSA-jm6p-wfjg-xm7x ssddanbrown/bookstack (Packagist) Fixed in 21.11.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-4026
- 2026-10-03 Alias added: GHSA-jm6p-wfjg-xm7x
References
More bookstackapp Bookstack vulnerabilities
- TI-2021-02995 Improper Access Control in bookstackapp/bookstack CVSS 3.1CRITICAL 9.8
- 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
Sources
- CVE-2021-4026 · CVE Program
- CVE-2021-4026 · NVD
- FIRST EPSS
- GHSA-jm6p-wfjg-xm7x · GitHub Advisory Database · CC BY 4.0
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