CVE-2025-0520
Published: April 11, 2026
Official Description
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.
Technical Analysis
CVE-2025-0520 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2025-0520 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
News & Research Mentioning CVE-2025-0520
A critical security vulnerability impacting ShowDoc, a document management and collaboration service popular in China, has come under active exploitation in the wild. The vulnerability in question is CVE-2025-0520 (aka CNVD-2020-26585), which carries a CVSS score of 9.4 out of 10.0. It relates to a case of unrestricted file upload that stems from improper validation of [xlite_meta score:59 src:The Hacker News xlite_fp:f74095e9b1ca13800c998bbea741b830a0a271d743a2e9dd3b1f25c3648d99d8]
Quick Facts
Known Threat Actors
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2025-0520 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1