CVE-2025-3533
📋 TL;DR
This vulnerability allows attackers to inject malicious scripts via the 'Parent' parameter in YouDianCMS admin interface, leading to cross-site scripting (XSS). It affects YouDianCMS 9.5.21 installations with the vulnerable template file. Attackers can execute arbitrary JavaScript in the context of admin users who view the affected page.
💻 Affected Systems
- YouDianCMS
📦 What is this software?
Youdiancms by Youdiancms
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal admin session cookies, perform actions as administrators, deface the site, or redirect users to malicious sites.
Likely Case
Attackers inject malicious scripts that steal admin credentials or session tokens when administrators view the vulnerable page.
If Mitigated
With proper input validation and output encoding, the XSS payloads would be neutralized before execution.
🎯 Exploit Status
Exploit details are publicly disclosed. Attack requires access to the admin interface or ability to inject into the Parent parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Vendor did not respond to disclosure. Consider workarounds or alternative CMS solutions.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement proper input validation for the Parent parameter and encode all output in the template file
Edit /App/Tpl/Admin/Default/Channel/index.html to sanitize Parent parameter input and encode output
Web Application Firewall (WAF) Rules
allDeploy WAF rules to block XSS payloads targeting the Parent parameter
Configure WAF to detect and block patterns like <script>, javascript:, and other XSS indicators in Parent parameter
🧯 If You Can't Patch
- Restrict access to the admin interface using IP whitelisting or VPN
- Implement Content Security Policy (CSP) headers to mitigate XSS impact
🔍 How to Verify
Check if Vulnerable:
Check if YouDianCMS version is 9.5.21 and the file /App/Tpl/Admin/Default/Channel/index.html exists without proper input sanitizationCheck Version:
Check CMS version in admin panel or configuration filesVerify Fix Applied:
Test the Parent parameter with XSS payloads like <script>alert('test')</script> and verify they are properly encoded or blocked📡 Detection & Monitoring
Log Indicators:
- Unusual requests to /App/Tpl/Admin/Default/Channel/index.html with script tags or encoded payloads in parameters
- Multiple failed login attempts followed by access to vulnerable path
Network Indicators:
- HTTP requests containing XSS payloads in Parent parameter
- Unusual outbound connections from admin interface
SIEM Query:
source="web_logs" AND uri="*Channel/index.html*" AND (query="*<script>*" OR query="*javascript:*" OR query="*Parent=*script*")