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Remote Code Execution Vulnerability in ShowDoc

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: CRITICAL

Software Affected

ShowDoc versions prior to 2.8.7

Overview

Remote Code Execution vulnerability has been identified in ShowDoc which could allow a remote attacker to upload arbitrary files on the targeted system.

Target Audience: 

All end-user organizations and individuals using ShowDoc.

Risk Assessment:

High risk of remote code execution, unauthorized access and complete system compromise.

Impact Assessment:

Potential for full system takeover, unauthorized access, remote code execution.

Description

ShowDoc is an open-source web-based document management and collaboration service.

Remote Code Execution vulnerability exists in ShowDoc due to unrestricted file upload that stems from improper validation of file extension, which could allow an attacker to upload arbitrary PHP files and achieve remote code execution on the server with specially crafted requests.

Successful exploitation of this vulnerability could allow a remote attacker to gain unauthorized access and/or execute arbitrary code on the targeted system.

Solution

Apply appropriate updates as mentioned by the vendor:

https://thehackernews.com/2026/04/showdoc-rce-flaw-cve-2025-0520-actively.html

Vendor Information

ShowDoc

https://www.showdoc.com.cn/help-en/16882

References

ShowDoc

https://thehackernews.com/2026/04/showdoc-rce-flaw-cve-2025-0520-actively.html

CVE Name

CVE-2025-0520

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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