CVE-2026-24353
📋 TL;DR
This CVE describes a missing authorization vulnerability in the WordPress User Registration plugin that allows attackers to exploit incorrectly configured access control security levels. It enables arbitrary shortcode execution, potentially allowing unauthorized actions. All WordPress sites using User Registration plugin versions up to and including 4.4.9 are affected.
💻 Affected Systems
- WordPress User Registration 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 execute arbitrary shortcodes to gain administrative privileges, modify site content, inject malicious code, or potentially achieve remote code execution depending on other installed plugins/themes.
Likely Case
Unauthorized users could modify registration forms, access user data, or inject malicious content into pages via shortcode execution.
If Mitigated
With proper access controls and network segmentation, impact would be limited to the affected WordPress instance only.
🎯 Exploit Status
Exploitation requires some level of access but doesn't require administrative privileges. The vulnerability is publicly documented with technical details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.5.0
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'User Registration' plugin. 4. Click 'Update Now' if available. 5. Alternatively, download version 4.5.0+ from WordPress.org and manually update.
🔧 Temporary Workarounds
Disable User Registration Plugin
allTemporarily disable the vulnerable plugin until patching is possible
wp plugin deactivate user-registration
Restrict Access to Registration Pages
linuxUse web application firewall or .htaccess to restrict access to user registration functionality
# Add to .htaccess:
<FilesMatch "(registration|user-registration)\.php">
Order Deny,Allow
Deny from all
</FilesMatch>
🧯 If You Can't Patch
- Implement strict network access controls to limit who can access the WordPress admin interface
- Enable WordPress security plugins that monitor for suspicious shortcode execution attempts
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → User Registration → Version. If version is 4.4.9 or lower, you are vulnerable.Check Version:
wp plugin get user-registration --field=versionVerify Fix Applied:
Verify User Registration plugin version is 4.5.0 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual shortcode execution in WordPress debug logs
- Multiple failed authorization attempts on registration endpoints
- Unauthorized users accessing registration management functions
Network Indicators:
- Unusual POST requests to /wp-admin/admin-ajax.php with registration-related actions
- Requests to registration endpoints from unexpected IP ranges
SIEM Query:
source="wordpress.log" AND ("shortcode_execution" OR "user_registration" OR "registration_form") AND status="error"