CVE-2024-53762
📋 TL;DR
This vulnerability allows attackers to perform Cross-Site Request Forgery (CSRF) attacks that lead to Stored Cross-Site Scripting (XSS) in the FastBook WordPress plugin. It affects WordPress sites using FastBook versions up to 1.1, potentially enabling attackers to inject malicious scripts that execute when users visit compromised pages.
💻 Affected Systems
- Faster Themes FastBook – Responsive Appointment Booking and Scheduling System
⚠️ 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 inject malicious scripts that steal admin credentials, deface websites, or redirect users to malicious sites, compromising all visitors.
Likely Case
Attackers trick authenticated users into performing unintended actions, such as injecting ads or stealing session cookies from other users.
If Mitigated
With CSRF tokens and input validation, the risk is reduced to minimal, preventing unauthorized script injection.
🎯 Exploit Status
Exploitation requires tricking a user with admin privileges into clicking a malicious link, combining CSRF with XSS for stored payloads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 1.1 (check plugin updates for latest)
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find FastBook plugin and click 'Update Now' if available. 4. Alternatively, download the latest version from the WordPress repository and manually update.
🔧 Temporary Workarounds
Implement CSRF Protection
allAdd CSRF tokens to forms and validate them server-side to prevent unauthorized requests.
Modify plugin PHP files to include nonce tokens; e.g., wp_nonce_field() in WordPress.
Enable Content Security Policy (CSP)
allConfigure CSP headers to restrict script execution sources, mitigating XSS impact.
Add to .htaccess: Header set Content-Security-Policy "default-src 'self'; script-src 'self'" for Apache.
🧯 If You Can't Patch
- Disable the FastBook plugin immediately and use an alternative booking system.
- Restrict admin access to trusted IP addresses only to reduce attack surface.
🔍 How to Verify
Check if Vulnerable:
Check the plugin version in WordPress admin under Plugins > Installed Plugins; if version is 1.1 or lower, it is vulnerable.Check Version:
In WordPress, run: wp plugin list --name=fastbook --field=version (requires WP-CLI).Verify Fix Applied:
After updating, confirm the plugin version is above 1.1 and test forms for CSRF tokens and input sanitization.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to FastBook endpoints without referrer headers or CSRF tokens.
- Log entries showing script injections in stored content like appointments or settings.
Network Indicators:
- HTTP traffic with malicious script payloads in parameters to FastBook plugin URLs.
- Unexpected redirects or script loads from external domains on booking pages.
SIEM Query:
Example: source="web_logs" AND (url="*fastbook*" AND (method="POST" AND referrer="-")) OR (response_body="*<script>*" AND url="*fastbook*")