Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack
Priority LOW 28CWE-434Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-434.
Summary
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type
Why it matters now
EPSS 0.00961 61st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed bookstackapp/bookstack (bookstackapp): 21.10.3ssddanbrown/bookstack (Packagist): 21.0.3
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 21.10.3 | 21.10.3 | Patch available | CNA |
| — | ssddanbrown/bookstack (Packagist) | before 21.0.3 | 21.0.3 | Patch available | GHSA-w2f4-hxpm-mq98 |
- bookstackapp/bookstack Vendorbookstackapp Affected before 21.10.3 Fixed in 21.10.3 Patch available CNA
- ssddanbrown/bookstack (Packagist) Vendor— Affected before 21.0.3 Fixed in 21.0.3 Patch available GHSA-w2f4-hxpm-mq98
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:* | before 21.10.3 | Vulnerable | bookstackapp |
- cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:* Versions before 21.10.3 Vulnerable ·bookstackapp
Remediation
- Fix · CNA bookstackapp/bookstack (bookstackapp) Fixed in 21.10.3
- Fix · GHSA-w2f4-hxpm-mq98 ssddanbrown/bookstack (Packagist) Fixed in 21.0.3 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-3915
- 2026-10-03 Alias added: GHSA-w2f4-hxpm-mq98
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-2021-3915 · CVE Program
- CVE-2021-3915 · NVD
- FIRST EPSS
- GHSA-w2f4-hxpm-mq98 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences