CVE-2025-64353
📋 TL;DR
This vulnerability in the Polylang WordPress plugin allows attackers to perform object injection through deserialization of untrusted data. Attackers can execute arbitrary code on affected WordPress sites. All WordPress installations using vulnerable versions of Polylang are affected.
💻 Affected Systems
- Polylang 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
Complete server compromise leading to data theft, ransomware deployment, or website defacement
Likely Case
Unauthorized code execution leading to backdoor installation, data exfiltration, or site takeover
If Mitigated
Limited impact if proper input validation and security controls prevent exploitation
🎯 Exploit Status
Deserialization vulnerabilities are commonly exploited with available tooling
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.7.4 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel
2. Navigate to Plugins > Installed Plugins
3. Find Polylang and click 'Update Now'
4. Verify update to version 3.7.4 or later
🔧 Temporary Workarounds
Disable Polylang Plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate polylang
Restrict Plugin Access
allUse web application firewall to block requests to Polylang endpoints
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user inputs
- Deploy web application firewall with deserialization attack detection
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Polylang versionCheck Version:
wp plugin get polylang --field=versionVerify Fix Applied:
Confirm Polylang version is 3.7.4 or higher📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to Polylang endpoints
- Serialized data in unexpected locations
- PHP object injection errors
Network Indicators:
- HTTP requests containing serialized PHP objects
- Traffic to Polylang admin-ajax.php with suspicious parameters
SIEM Query:
source="wordpress" AND (uri_path="*polylang*" OR plugin="polylang") AND (http_method="POST" AND (data="*O:*" OR data="*C:*"))