CVE-2024-4382
📋 TL;DR
This CSRF vulnerability in the CB (legacy) WordPress plugin allows attackers to trick logged-in administrators into performing unauthorized bulk actions like deleting codes, timeframes, and bookings. Any WordPress site using the vulnerable plugin versions is affected, particularly those with administrator accounts that might visit malicious pages while authenticated.
💻 Affected Systems
- CB (legacy) WordPress plugin
📦 What is this software?
Commonsbooking by Wielebenwir
⚠️ Risk & Real-World Impact
Worst Case
Attackers could delete all booking data, codes, and timeframes, causing complete data loss and service disruption for the affected WordPress site.
Likely Case
Partial data deletion or modification of booking systems, leading to operational issues and potential financial/reputation damage.
If Mitigated
With proper CSRF protections or plugin updates, the risk is eliminated as legitimate anti-CSRF tokens would block unauthorized requests.
🎯 Exploit Status
Exploitation requires social engineering to trick authenticated admins, but the CSRF attack itself is technically simple once the target visits a malicious page.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.9.4.19 or later
Vendor Advisory: https://wpscan.com/vulnerability/1a67aeab-8145-4c8a-9c18-e6436fa39b63/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins. 3. Find 'CB (legacy)' plugin. 4. Click 'Update Now' if available. 5. Alternatively, download latest version from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily deactivate the CB (legacy) plugin until patched
wp plugin deactivate cb-legacy
Implement CSRF protection middleware
allAdd custom WordPress filter to validate nonce tokens for bulk actions
Add custom PHP code to theme functions.php or create a security plugin
🧯 If You Can't Patch
- Restrict administrator account usage to dedicated admin workstations only
- Implement web application firewall rules to detect and block CSRF patterns
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > CB (legacy) version numberCheck Version:
wp plugin get cb-legacy --field=versionVerify Fix Applied:
Confirm plugin version is 0.9.4.19 or higher in WordPress admin📡 Detection & Monitoring
Log Indicators:
- Multiple DELETE/POST requests to /wp-admin/admin.php?page=cb-legacy from same session without referrer validation
- Unexpected bulk deletion events in booking/code logs
Network Indicators:
- HTTP requests to bulk action endpoints without proper Referer headers or nonce parameters
SIEM Query:
source="wordpress.log" AND ("cb-legacy" OR "bulk-action") AND (http_method=POST OR http_method=DELETE) AND NOT csrf_token=*