CVE-2025-11723
📋 TL;DR
This vulnerability allows unauthenticated attackers to generate valid authentication tokens for WordPress sites using the Simply Schedule Appointments Booking Plugin. Attackers can access and modify booking information on sites that haven't manually configured a salt in wp-config.php. All WordPress sites using this plugin up to version 1.6.9.5 are affected.
💻 Affected Systems
- Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin for WordPress
⚠️ 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 access all booking data, modify appointments, delete bookings, or disrupt business operations by manipulating the scheduling system.
Likely Case
Unauthorized access to booking information, potential modification of appointments, and exposure of customer data including names, contact details, and appointment times.
If Mitigated
No impact if proper salt configuration is in place or plugin is updated.
🎯 Exploit Status
Exploitation requires knowledge of the hardcoded salt and understanding of the token generation mechanism.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.6.9.6 or later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3393919/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Simply Schedule Appointments'. 4. Click 'Update Now' if available. 5. Alternatively, download latest version from WordPress repository and upload manually.
🔧 Temporary Workarounds
Configure Custom Salt in wp-config.php
allAdd unique authentication salts and keys to prevent use of hardcoded fallback
Add to wp-config.php: define('AUTH_KEY', 'your-unique-key-here'); define('SECURE_AUTH_KEY', 'your-unique-key-here'); define('LOGGED_IN_KEY', 'your-unique-key-here'); define('NONCE_KEY', 'your-unique-key-here');
🧯 If You Can't Patch
- Disable the plugin immediately and use alternative booking solutions
- Implement web application firewall rules to block suspicious booking-related requests
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Simply Schedule Appointments version. If version is 1.6.9.5 or lower, you are vulnerable.Check Version:
wp plugin get simply-schedule-appointments --field=versionVerify Fix Applied:
Verify plugin version is 1.6.9.6 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual booking modifications from unexpected IPs
- Multiple failed booking attempts followed by successful unauthorized access
- Booking API calls without proper authentication
Network Indicators:
- Unusual patterns in booking-related API requests
- Requests to booking endpoints with manipulated tokens
SIEM Query:
source="wordpress.log" AND ("simply-schedule" OR "booking") AND ("unauthorized" OR "modification" OR "token")