CVE-2025-9489
📋 TL;DR
The WP-Members Membership Plugin for WordPress has a vulnerability that allows authenticated users with Subscriber-level access or higher to execute arbitrary shortcodes. This occurs because the plugin doesn't properly validate user input before passing it to WordPress's do_shortcode function. All WordPress sites using WP-Members plugin versions up to 3.5.4.2 are affected.
💻 Affected Systems
- WP-Members Membership 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 execute malicious shortcodes that perform actions like creating administrator accounts, modifying content, or executing arbitrary PHP code if vulnerable shortcodes exist.
Likely Case
Attackers with subscriber accounts could inject unauthorized content, modify site appearance, or exploit other vulnerable shortcodes to gain elevated privileges.
If Mitigated
With proper input validation and least privilege access controls, impact is limited to content manipulation by authenticated users.
🎯 Exploit Status
Requires authenticated access (Subscriber role or higher). Exploitation requires knowledge of WordPress shortcodes and their capabilities.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 3.5.4.3 or later
Vendor Advisory: https://wordpress.org/plugins/wp-members/#developers
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find WP-Members plugin. 4. Click 'Update Now' if update available. 5. Alternatively, download latest version from WordPress plugin repository and manually update.
🔧 Temporary Workarounds
Disable vulnerable shortcode functionality
allTemporarily disable the specific shortcode execution functionality until patched
Add to theme's functions.php: remove_shortcode('wpmem_field');
🧯 If You Can't Patch
- Restrict user registration and review existing subscriber accounts for suspicious activity
- Implement web application firewall rules to block suspicious shortcode patterns in POST requests
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins → WP-Members version. If version is 3.5.4.2 or lower, system is vulnerable.Check Version:
wp plugin list --name=wp-members --field=versionVerify Fix Applied:
After update, verify WP-Members plugin version shows 3.5.4.3 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual shortcode execution in WordPress debug logs
- Multiple failed authentication attempts followed by successful subscriber login
Network Indicators:
- POST requests containing unusual shortcode patterns to wp-admin/admin-ajax.php
SIEM Query:
source="wordpress" AND (shortcode="[wpmem_field" OR action="wpmem_shortcode")🔗 References
- https://plugins.trac.wordpress.org/browser/wp-members/tags/3.5.4.2/includes/class-wp-members-shortcodes.php#L69
- https://plugins.trac.wordpress.org/browser/wp-members/tags/3.5.4.2/includes/class-wp-members-shortcodes.php#L983
- https://www.wordfence.com/threat-intel/vulnerabilities/id/aa2035ef-5251-49cc-a480-b6c167b5ef8c?source=cve
