CVE-2025-39541
📋 TL;DR
CVE-2025-39541 is a missing authorization vulnerability in the WP Simple Booking Calendar WordPress plugin that allows attackers to perform unauthorized actions. This affects all WordPress sites running WP Simple Booking Calendar versions up to 2.0.13. Attackers could potentially modify booking data or access restricted functionality.
💻 Affected Systems
- WP Simple Booking Calendar WordPress 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 manipulate booking data, delete reservations, modify calendar settings, or potentially escalate privileges within the WordPress environment.
Likely Case
Unauthorized users could view or modify booking information, disrupt business operations, or cause data integrity issues in the booking system.
If Mitigated
With proper access controls and authentication checks, impact would be limited to authorized users only, maintaining data confidentiality and integrity.
🎯 Exploit Status
Exploitation requires understanding of WordPress plugin structure and API endpoints, but no authentication is bypassed - authorization checks are missing on existing endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0.14 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find WP Simple Booking Calendar. 4. Click 'Update Now' if available. 5. Alternatively, download latest version from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable Plugin
WordPressTemporarily disable the vulnerable plugin until patched
wp plugin deactivate wp-simple-booking-calendar
Restrict Access
allImplement IP whitelisting or firewall rules to restrict access to WordPress admin and plugin endpoints
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block unauthorized access to booking calendar endpoints
- Enable detailed logging and monitoring for unauthorized access attempts to booking functionality
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for WP Simple Booking Calendar versionCheck Version:
wp plugin get wp-simple-booking-calendar --field=versionVerify Fix Applied:
Verify plugin version is 2.0.14 or higher in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unauthorized POST/PUT requests to booking calendar endpoints
- Multiple failed authentication attempts followed by successful booking modifications
Network Indicators:
- Unusual traffic patterns to /wp-content/plugins/wp-simple-booking-calendar/ endpoints from unauthorized IPs
SIEM Query:
source="wordpress.log" AND (uri_path="/wp-json/wp-simple-booking-calendar" OR uri_path="/wp-content/plugins/wp-simple-booking-calendar") AND (http_method="POST" OR http_method="PUT") AND user="unauthenticated"