CVE-2024-13821
📋 TL;DR
The WP Booking Calendar plugin for WordPress has a vulnerability that allows unauthenticated attackers to modify confirmed bookings after they've been approved. This occurs because the plugin doesn't properly verify user identity when changes are attempted post-confirmation. All WordPress sites using this plugin up to version 10.10 are affected.
💻 Affected Systems
- WP Booking Calendar WordPress Plugin
📦 What is this software?
Booking Calendar by Wpbookingcalendar
⚠️ Risk & Real-World Impact
Worst Case
Attackers could cancel legitimate bookings, modify booking details to cause business disruption, or potentially inject malicious content into booking data that might be displayed to administrators.
Likely Case
Attackers manipulate their own bookings to cause scheduling conflicts, administrative overhead, or minor business disruption.
If Mitigated
With proper access controls and monitoring, impact is limited to booking system manipulation that can be detected and rolled back.
🎯 Exploit Status
The vulnerability is straightforward to exploit as it requires no authentication and involves simple HTTP requests to manipulate booking data.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.11 or later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3234469%40booking&new=3234469%40booking&sfp_email=&sfph_mail=#file20
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find WP Booking Calendar and click 'Update Now'. 4. Verify version is 10.11 or higher.
🔧 Temporary Workarounds
Disable Booking Modification
allTemporarily disable booking modification functionality in plugin settings
Temporary Plugin Deactivation
linuxDeactivate the plugin until patched if bookings are not critical
wp plugin deactivate booking-calendar
🧯 If You Can't Patch
- Implement web application firewall rules to block booking modification requests from unauthenticated users
- Enable detailed logging of all booking modification attempts and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for WP Booking Calendar versionCheck Version:
wp plugin get booking-calendar --field=versionVerify Fix Applied:
Verify plugin version is 10.11 or higher in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual booking modification patterns
- Booking changes from unauthenticated IP addresses
- Multiple booking modifications in short timeframes
Network Indicators:
- POST requests to booking modification endpoints without authentication headers
- Unusual traffic to /wp-content/plugins/booking-calendar/ endpoints
SIEM Query:
source="wordpress.log" AND ("booking-calendar" OR "booking modification") AND status="200" AND NOT user_agent="WordPress/*"