CVE-2025-65837
📋 TL;DR
PublicCMS V5.202506.b contains a cross-site scripting (XSS) vulnerability in its Content Search module. This allows attackers to inject malicious scripts that execute in users' browsers when they interact with search functionality. Any organization using this specific version of PublicCMS is affected.
💻 Affected Systems
- PublicCMS
📦 What is this software?
Publiccms by Publiccms
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, perform actions as authenticated users, deface websites, or redirect users to malicious sites.
Likely Case
Attackers inject malicious scripts to steal user session data or credentials from users who interact with search functionality.
If Mitigated
With proper input validation and output encoding, the impact is limited to potential script execution in specific contexts.
🎯 Exploit Status
XSS vulnerabilities are commonly weaponized and easy to exploit with basic web security knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://github.com/sanluan/PublicCMS/issues/100
Restart Required: No
Instructions:
1. Monitor the GitHub issue for official patch. 2. Consider upgrading to a newer version if available. 3. Apply input validation and output encoding to the Content Search module.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement proper input validation and output encoding in the Content Search module to prevent script injection.
Content Security Policy (CSP)
allImplement a strict Content Security Policy to mitigate XSS impact by restricting script execution sources.
🧯 If You Can't Patch
- Disable or restrict access to the Content Search module if not essential
- Implement web application firewall (WAF) rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Test the Content Search functionality with XSS payloads like <script>alert('XSS')</script> and observe if scripts execute.Check Version:
Check PublicCMS version in admin panel or configuration files.Verify Fix Applied:
Retest with XSS payloads after applying fixes to confirm scripts no longer execute.📡 Detection & Monitoring
Log Indicators:
- Unusual search queries containing script tags or JavaScript code
- Multiple failed search attempts with suspicious patterns
Network Indicators:
- HTTP requests to search endpoints containing script tags or encoded payloads
SIEM Query:
source="web_logs" AND (uri="*search*" OR uri="*query*") AND (message="*<script>*" OR message="*javascript:*")