ShowDoc < 2.8.7 Unauthenticated File Upload Remote Code Execution
Priority HIGH 76CWE-434Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · Low
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-434.
Summary
An unrestricted file upload vulnerability in ShowDoc caused by improper validation of file extension allows execution of arbitrary PHP, leading to remote code execution.This issue affects ShowDoc: before 2.8.7.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.02445 84th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed ShowDoc (ShowDoc): 2.8.7showdoc/showdoc (Packagist): 2.8.7
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| star7th | ShowDoc | before 2.8.7 | 2.8.7 | Patch available | CNA |
| — | showdoc/showdoc (Packagist) | before 2.8.7 | 2.8.7 | Patch available | GHSA-6jmr-r7p6-f5wr |
- ShowDoc Vendorstar7th Affected before 2.8.7 Fixed in 2.8.7 Patch available CNA
- showdoc/showdoc (Packagist) Vendor— Affected before 2.8.7 Fixed in 2.8.7 Patch available GHSA-6jmr-r7p6-f5wr
Remediation
- Fix · CNA ShowDoc (ShowDoc) Fixed in 2.8.7
- Fix · GHSA-6jmr-r7p6-f5wr showdoc/showdoc (Packagist) Fixed in 2.8.7 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-0520
- 2026-10-03 Alias added: GHSA-6jmr-r7p6-f5wr
References
More star7th vulnerabilities
- TI-2026-59246 star7th showdoc API Page Save Endpoint editormd.js cross site scripting CVSS 4.0MEDIUM 5.1
- TI-2021-14768 Unrestricted File Upload in ShowDoc v2.9.5 allows remote attackers to execute arbitrary… CVSS 3.1CRITICAL 9.8
- TI-2022-00287 SQL Injection in star7th/showdoc CVSS 3.1CRITICAL 9.8
- TI-2021-18398 ShowDoc 2.8.3 ihas a file upload vulnerability, where attackers can use the vulnerability to obtain server permissions. CVSS 3.1CRITICAL 9.8
- TI-2026-83553 Code injection in ShowDoc Mock templates lets users run commands CVSS 4.0HIGH 8.7
- TI-2021-03036 Cross-Site Request Forgery (CSRF) in star7th/showdoc CVSS 3.1HIGH 8.8
Sources
- CVE-2025-0520 · CVE Program
- CVE-2025-0520 · NVD
- FIRST EPSS
- GHSA-6jmr-r7p6-f5wr · 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