CVE-2025-54751
📋 TL;DR
This CVE describes a Missing Authorization vulnerability in the WPXPO PostX (ultimate-post) WordPress plugin that allows attackers to bypass access controls. It affects all WordPress sites running PostX plugin versions up to and including 4.1.36. Attackers could exploit this to access restricted functionality or data.
💻 Affected Systems
- WPXPO PostX (ultimate-post) 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 gain administrative privileges, modify content, install backdoors, or exfiltrate sensitive data from the WordPress site.
Likely Case
Unauthorized users could access restricted posts, modify content they shouldn't have access to, or perform actions reserved for higher-privileged users.
If Mitigated
With proper access controls and least privilege principles, impact would be limited to specific functionality bypass rather than full compromise.
🎯 Exploit Status
Access control bypass vulnerabilities are frequently exploited in WordPress environments. While no public PoC is confirmed, similar vulnerabilities are often weaponized quickly.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.1.37 or later
Vendor Advisory: https://patchstack.com/database/Wordpress/Plugin/ultimate-post/vulnerability/wordpress-postx-plugin-4-1-36-broken-access-control-vulnerability?_s_id=cve
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'PostX – Gutenberg Blocks for Post Grid' and click 'Update Now'. 4. Verify version is 4.1.37 or higher.
🔧 Temporary Workarounds
Disable PostX Plugin
allTemporarily disable the vulnerable plugin until patching is possible
wp plugin deactivate ultimate-post
Restrict Access via .htaccess
linuxAdd access restrictions to PostX plugin directories
# Add to .htaccess in wp-content/plugins/ultimate-post/
Order Deny,Allow
Deny from all
🧯 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 unauthorized access attempts and block suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins → PostX version. If version is 4.1.36 or lower, you are vulnerable.Check Version:
wp plugin get ultimate-post --field=versionVerify Fix Applied:
After updating, verify PostX plugin shows version 4.1.37 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to PostX plugin endpoints
- Users accessing functionality beyond their role permissions
- POST requests to PostX admin-ajax.php with unusual parameters
Network Indicators:
- Unusual traffic patterns to /wp-content/plugins/ultimate-post/ endpoints
- Requests bypassing normal authentication flows
SIEM Query:
source="wordpress.log" AND ("ultimate-post" OR "postx") AND (status=403 OR status=401) AND user_role!="administrator"