CVE-2025-54693
📋 TL;DR
This vulnerability allows attackers to upload arbitrary files, including web shells, to WordPress servers running the vulnerable Form Block plugin. Attackers can achieve remote code execution and full server compromise. All WordPress sites using Form Block version 1.5.5 or earlier are affected.
💻 Affected Systems
- WordPress Form Block 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
Complete server takeover with persistent backdoor installation, data exfiltration, and lateral movement to other systems.
Likely Case
Web shell upload leading to website defacement, data theft, and cryptocurrency mining malware installation.
If Mitigated
File uploads blocked at web application firewall level, limiting impact to failed upload attempts.
🎯 Exploit Status
Simple HTTP POST requests with malicious file uploads can exploit this vulnerability without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.5.6 or later
Vendor Advisory: https://patchstack.com/database/wordpress/plugin/form-block/vulnerability/wordpress-form-block-plugin-1-5-5-arbitrary-file-upload-vulnerability?_s_id=cve
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Form Block' plugin. 4. Click 'Update Now' if update available. 5. If no update available, deactivate and delete the plugin immediately.
🔧 Temporary Workarounds
Disable Form Block Plugin
allTemporarily disable the vulnerable plugin until patched version is available.
wp plugin deactivate form-block
Web Application Firewall Rule
allBlock file uploads to Form Block endpoints at WAF level.
Block POST requests to /wp-content/plugins/form-block/* with file uploads
🧯 If You Can't Patch
- Remove the Form Block plugin completely from all WordPress installations
- Implement strict file upload restrictions at server level using .htaccess or nginx rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Form Block version. If version is 1.5.5 or earlier, you are vulnerable.Check Version:
wp plugin get form-block --field=versionVerify Fix Applied:
Verify Form Block plugin version is 1.5.6 or later in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /wp-content/plugins/form-block/upload.php with .php, .phtml, or other executable file extensions
- Unusual file creations in wp-content/uploads/form-block/ directory
Network Indicators:
- HTTP POST requests with file uploads to Form Block endpoints from unexpected sources
- Outbound connections from WordPress server to unknown IPs after file uploads
SIEM Query:
source="web_server" AND (uri_path="/wp-content/plugins/form-block/*" AND http_method="POST" AND file_extension IN ("php", "phtml", "phar"))