CVE-2025-0520

ShowDoc < 2.8.7 Unauthenticated File Upload Remote Code Execution

9.4 CriticalFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: Low

Exploit likelihood

2.44%Up 2.2 points since Apr 30, 2025

What each source reports

CVE List Score used 9.4

ShowDoc < 2.8.7 Unauthenticated File Upload Remote Code Execution

Record: CVE-2025-0520
CVSS 4.0: 9.4 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
Weakness: CWE-434
Updated: 2026-11-02

EUVDEUVD-2025-12661 9.4

Record: EUVD-2025-12661
CVSS 4.0: 9.4 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
Updated: 2026-11-02

GitHub AdvisoriesGHSA-6jmr-r7p6-f5wr 9.4

ShowDoc unrestricted file upload vulnerability

Record: GHSA-6jmr-r7p6-f5wr
CVSS 4.0: 9.4 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
Weakness: CWE-434
Updated: 2026-11-02

NVD 9.4

Record: CVE-2025-0520
CVSS 4.0: 9.4 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness: CWE-434
Updated: 2026-11-02

OSV 9.4

ShowDoc < 2.8.7 Unauthenticated File Upload Remote Code Execution

Record: CVE-2025-0520
CVSS 4.0: 9.4 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
Weakness: CWE-434
Updated: 2026-11-02

OSVGHSA-6jmr-r7p6-f5wr 9.4

ShowDoc unrestricted file upload vulnerability

Record: GHSA-6jmr-r7p6-f5wr
CVSS 4.0: 9.4 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
Weakness: CWE-434
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`showdoc/showdoc` Packagist	before 2.8.7	2.8.7
`showdoc/showdoc` Packagist	before 2.8.7, plus listed versions v1.0.0v1.0.1v1.0.2v1.0.3v1.0.4 Show 45 moreShow less v1.0.5v1.1.0v1.1.1v1.1.3v1.1.4v1.1.5v1.2.0v1.2.1v1.2.2v1.2.3v1.2.4v1.2.5v1.2.6v1.3.0v1.3.1v1.3.3v1.3.4v1.3.5v1.3.6v1.3.7v1.3.8v1.4.0v1.4.1v1.4.2v1.4.3v1.4.4v1.4.5v1.4.6v1.4.7v1.5.0v1.5.1v1.5.2v1.5.3v1.6.0v1.6.1v1.6.2v1.7.0v1.7.1v1.7.2v1.8.0v1.8.1v1.8.2v1.8.3v1.8.4v1.8.5	2.8.7

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Nuclei	ShowDoc - Remote Code Execution

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, Nuclei, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-0520 is a critical vulnerability (CVSS 9.4) in Showdoc, published April 29, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.44%, the 84th percentile. Fixed in showdoc/showdoc 2.8.7.

References

This page doesn't list everything

Left out here: 57 versions. The JSON record has them.