CVE-2025-39410
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary PHP code through deserialization of untrusted data in the Smart Sections Theme Builder plugin for WPBakery Page Builder. It affects WordPress sites using vulnerable versions of this plugin, potentially leading to complete site compromise.
💻 Affected Systems
- Smart Sections Theme Builder - WPBakery Page Builder Addon
⚠️ 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
Remote code execution leading to complete server takeover, data theft, malware deployment, and site defacement.
Likely Case
Unauthenticated attackers gain shell access, install backdoors, and establish persistent access to the WordPress site.
If Mitigated
With proper WAF rules and input validation, exploitation attempts are blocked, but the vulnerability remains present.
🎯 Exploit Status
Public exploit details available on Patchstack. CVSS 9.8 indicates trivial exploitation with high impact.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.7.9 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Smart Sections Theme Builder - WPBakery Page Builder Addon'. 4. Click 'Update Now' if update available. 5. If no update, deactivate and remove plugin immediately.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the vulnerable plugin until patched version is available.
wp plugin deactivate visucom-smart-sections
WAF Rule for Deserialization
linuxAdd web application firewall rule to block PHP object injection attempts.
# Example ModSecurity rule: SecRule ARGS "@rx (O:\d+:\"[^\"]+\":\d+:\{[^}]+\})" "id:1001,phase:2,deny,msg:'PHP Object Injection Attempt'
🧯 If You Can't Patch
- Remove the plugin completely from the WordPress installation
- Implement strict input validation and sanitization for all plugin-related parameters
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for 'Smart Sections Theme Builder' version 1.7.8 or earlier.Check Version:
wp plugin get visucom-smart-sections --field=versionVerify Fix Applied:
Verify plugin version is 1.7.9 or later in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to plugin endpoints
- PHP error logs containing unserialize() warnings
- Web server logs with suspicious parameter patterns
Network Indicators:
- HTTP requests containing serialized PHP objects in parameters
- Traffic to known exploit paths for this plugin
SIEM Query:
source="web_logs" AND (uri="*smart-sections*" OR uri="*visucom*") AND (params="*O:*" OR params="*serialize*" OR params="*unserialize*")