---
id: CVE-2025-0520
title: >-
  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.
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.
severity: critical
cvss: 9.4
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L'
cwe:
  - CWE-434
vendor: ShowDoc
product: ShowDoc
affected:
  - ShowDoc < 2.8.7
published: '2025-04-29'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T16:16:50.227'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-0520'
references:
  - url: 'https://github.com/star7th/showdoc/pull/1059'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/vulhub/vulhub/tree/master/showdoc/CNVD-2020-26585'
    label: disclosure@vulncheck.com
  - url: 'https://www.cnvd.org.cn/flaw/show/CNVD-2020-26585'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/showdoc-unauthenticated-file-upload-rce
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2025-04-29T20:38:44.727309Z'
cvssSource: cna
epss: 0.02647
epssPercentile: 0.85159
exploits:
  nuclei:
    - CVE-2025-0520
  checkedAt: '2026-10-08T16:52:49.753Z'
ingestedAt: '2026-10-08T16:52:14.662Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.