CVE-2024-32720
📋 TL;DR
This vulnerability allows attackers to bypass CAPTCHA protection in the Appointment Hour Booking WordPress plugin through excessive authentication attempts, enabling them to remove important client functionality. It affects all WordPress sites using Appointment Hour Booking plugin versions up to and including 1.4.56.
💻 Affected Systems
- WordPress Appointment Hour Booking Plugin
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could delete or modify booking data, disrupt appointment scheduling functionality, or potentially gain unauthorized access to administrative functions.
Likely Case
Malicious actors bypass CAPTCHA to spam booking forms, delete legitimate appointments, or disrupt business operations.
If Mitigated
With proper rate limiting and CAPTCHA implementation, impact is limited to potential service disruption from excessive requests.
🎯 Exploit Status
Exploitation requires sending excessive authentication attempts to bypass CAPTCHA protection.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.4.57 or later
Vendor Advisory: https://patchstack.com/database/vulnerability/appointment-hour-booking/wordpress-appointment-hour-booking-plugin-1-4-56-captcha-bypass-vulnerability
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Appointment Hour Booking'. 4. Click 'Update Now' if available. 5. Alternatively, download version 1.4.57+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Implement Web Application Firewall (WAF)
allConfigure WAF rules to limit authentication attempts and block excessive requests to booking endpoints.
Disable Plugin Temporarily
linuxDeactivate the Appointment Hour Booking plugin until patched, using alternative booking methods.
wp plugin deactivate appointment-hour-booking
🧯 If You Can't Patch
- Implement rate limiting at the web server level (e.g., using mod_evasive for Apache or limit_req for Nginx)
- Monitor booking form logs for excessive authentication attempts and implement IP blocking for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for Appointment Hour Booking version. If version is 1.4.56 or lower, system is vulnerable.Check Version:
wp plugin get appointment-hour-booking --field=versionVerify Fix Applied:
Verify plugin version is 1.4.57 or higher in WordPress admin panel. Test booking form CAPTCHA functionality.📡 Detection & Monitoring
Log Indicators:
- Excessive POST requests to /wp-admin/admin-ajax.php with booking-related actions
- Multiple failed CAPTCHA validation attempts from single IP
Network Indicators:
- High volume of requests to booking endpoints from single source
- Pattern of repeated authentication attempts
SIEM Query:
source="wordpress.log" AND "admin-ajax.php" AND "action=cpabc_appointments_check_captcha" | stats count by src_ip | where count > 10🔗 References
- https://patchstack.com/database/vulnerability/appointment-hour-booking/wordpress-appointment-hour-booking-plugin-1-4-56-captcha-bypass-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/appointment-hour-booking/wordpress-appointment-hour-booking-plugin-1-4-56-captcha-bypass-vulnerability?_s_id=cve
