CVE-2023-53910
📋 TL;DR
WBCE CMS 1.6.1 contains a stored cross-site scripting vulnerability that allows authenticated users to inject malicious JavaScript into page content via the WYSIWYG editor. This can lead to session hijacking, credential theft, or defacement when other users view the compromised pages. Only WBCE CMS installations with version 1.6.1 are affected.
💻 Affected Systems
- WBCE CMS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, hijack user sessions, deface websites, or redirect users to malicious sites, potentially leading to complete site compromise.
Likely Case
Authenticated attackers with content editing privileges inject malicious scripts to steal session cookies or credentials from other users viewing affected pages.
If Mitigated
With proper input validation and output encoding, malicious scripts would be sanitized before execution, preventing successful exploitation.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward via POST requests to /wbce/modules/wysiwyg/save.php with malicious script content.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.6.2 or later
Vendor Advisory: https://wbce-cms.org/
Restart Required: No
Instructions:
1. Backup your WBCE CMS installation and database. 2. Download the latest version from the official website. 3. Replace the affected files, particularly focusing on /modules/wysiwyg/save.php and related editor components. 4. Verify the update by checking the version in the admin panel.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to sanitize HTML content before saving to database
Modify /wbce/modules/wysiwyg/save.php to include HTML sanitization library like HTMLPurifier
Content Security Policy
allImplement CSP headers to restrict script execution sources
Add 'Content-Security-Policy: script-src 'self'' to HTTP headers
🧯 If You Can't Patch
- Restrict content editing permissions to trusted administrators only
- Implement web application firewall rules to block POST requests containing script tags to the vulnerable endpoint
🔍 How to Verify
Check if Vulnerable:
Check if version is 1.6.1 in admin panel or by examining /wbce/info.php. Test by attempting to save page content with <script>alert('test')</script> via the WYSIWYG editor.Check Version:
Check admin panel dashboard or view /wbce/info.php in browserVerify Fix Applied:
After patching, attempt the same XSS test. The script should be sanitized or blocked. Verify version shows 1.6.2 or later.📡 Detection & Monitoring
Log Indicators:
- POST requests to /wbce/modules/wysiwyg/save.php containing script tags or JavaScript code
- Unusual content updates from user accounts
Network Indicators:
- HTTP POST requests to vulnerable endpoint with suspicious content parameters
- Outbound connections to external domains from page views
SIEM Query:
source="web_server" AND (url_path="/wbce/modules/wysiwyg/save.php" AND method="POST" AND content="*<script>*")