Unrestricted File Upload Vulnerability in ShowDoc Affects Users
CVE-2025-0520

9.4CRITICAL

Key Information:

Vendor

Showdoc

Status
Showdoc
Vendor
CVE Published:
29 April 2025

Badges

👾 Exploit Exists🟡 Public PoC📰 News Worthy

What is CVE-2025-0520?

An unrestricted file upload vulnerability in ShowDoc arises from inadequate validation of file extensions, allowing an attacker to upload malicious PHP files. This can lead to unauthorized remote code execution on affected systems, posing a significant security risk for users unable to mitigate the flaw. The vulnerability impacts all versions of ShowDoc prior to 2.8.7.

Affected Version(s)

ShowDoc 0 < 2.8.7

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-0520 - Proof of Concept

News Articles

favicon imageThe Hacker News

ShowDoc RCE Flaw CVE-2025-0520 Actively Exploited on Unpatched Servers

ShowDoc CVE-2025-0520 exploited due to unpatched versions before 2.8.7, enabling remote code execution on 2,000+ instances.

18 hours ago

References

https://github.com/vulhub/vulhub/tree/master/showdoc/CNVD...
exploit
https://github.com/star7th/showdoc/pull/1059
patchissue-tracking
https://www.cnvd.org.cn/flaw/show/CNVD-2020-26585
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 📰

    First article discovered by The Hacker News

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.