CVE-2025-54739
📋 TL;DR
This CVE describes a missing authorization vulnerability in POSIMYTH Nexter Blocks WordPress plugin that allows attackers to bypass intended access controls. It affects all versions up to 4.5.4, potentially enabling unauthorized access to restricted functionality. WordPress sites using vulnerable versions of this plugin are affected.
💻 Affected Systems
- POSIMYTH Nexter Blocks (The Plus Addons for Block Editor)
⚠️ 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 site content, install malicious plugins/themes, or access sensitive user data.
Likely Case
Unauthorized users accessing restricted plugin functionality, potentially modifying content or settings they shouldn't have access to.
If Mitigated
With proper access controls and authentication checks, impact would be limited to attempted unauthorized access that gets blocked.
🎯 Exploit Status
Requires some understanding of WordPress plugin structure and access control mechanisms. Likely requires authenticated access to some degree.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 4.5.5 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'The Plus Addons for Block Editor'. 4. Click 'Update Now' if update available. 5. Alternatively, download version 4.5.5+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable vulnerable plugin
WordPressTemporarily disable the Nexter Blocks plugin until patched
wp plugin deactivate the-plus-addons-for-block-editor
🧯 If You Can't Patch
- Implement strict network access controls to limit who can access WordPress admin interface
- Enable WordPress security plugins that monitor for unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → The Plus Addons for Block Editor → Version. If version is 4.5.4 or lower, you are vulnerable.Check Version:
wp plugin get the-plus-addons-for-block-editor --field=versionVerify Fix Applied:
After updating, verify version shows 4.5.5 or higher in WordPress plugins list.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to plugin-specific admin endpoints
- Unexpected user role changes or privilege escalations
Network Indicators:
- Unusual POST requests to /wp-admin/admin-ajax.php with plugin-specific actions
SIEM Query:
source="wordpress" AND (uri_path="/wp-admin/admin-ajax.php" AND action CONTAINS "nexter" OR "plus_addons") AND response_code=200 AND user_role!="administrator"