CVE-2025-31396
📋 TL;DR
CVE-2025-31396 is a PHP object injection vulnerability in the FLAP Business WordPress theme that allows attackers to execute arbitrary code through deserialization of untrusted data. This affects WordPress sites using FLAP theme versions up to 1.5. Attackers can potentially gain complete control of affected websites.
💻 Affected Systems
- FLAP - Business WordPress Theme
⚠️ 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 website compromise, data theft, malware installation, and server takeover.
Likely Case
Website defacement, backdoor installation, data exfiltration, and privilege escalation.
If Mitigated
Limited impact if proper input validation and output encoding are implemented, but still significant risk.
🎯 Exploit Status
Exploitation requires sending specially crafted data to vulnerable endpoints. Public exploit details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 1.5
Restart Required: No
Instructions:
1. Update FLAP theme to latest version via WordPress admin panel. 2. If update not available, remove theme completely. 3. Verify no malicious code was injected during vulnerable period.
🔧 Temporary Workarounds
Disable FLAP Theme
allTemporarily switch to default WordPress theme until patch is applied
wp theme activate twentytwentyfour
wp theme delete flap
Input Validation Filter
allAdd custom filter to sanitize all user input before deserialization
Add custom PHP filter in theme functions.php or via plugin
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block deserialization attacks
- Restrict access to vulnerable endpoints using .htaccess or nginx rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Appearance > Themes for FLAP theme version 1.5 or earlierCheck Version:
wp theme list --name=flap --fields=name,status,versionVerify Fix Applied:
Verify FLAP theme version is greater than 1.5 or theme is completely removed📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to theme-specific endpoints
- PHP deserialization errors in error logs
- Unexpected file creation in wp-content directory
Network Indicators:
- HTTP requests containing serialized PHP objects
- Traffic to known exploit patterns for CVE-2025-31396
SIEM Query:
source="web_logs" AND (uri_path="*flap*" OR user_agent="*exploit*" OR http_method="POST" AND status_code="200" AND bytes>10000)