CVE-2026-23544
📋 TL;DR
This CVE describes a PHP object injection vulnerability in the Valenti WordPress theme caused by unsafe deserialization of untrusted data. Attackers can exploit this to execute arbitrary code on affected WordPress installations. All WordPress sites using Valenti theme versions up to and including 5.6.3.5 are vulnerable.
💻 Affected Systems
- WordPress Valenti 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 system compromise, data theft, and website defacement.
Likely Case
Arbitrary code execution within WordPress context, potentially leading to backdoor installation and data exfiltration.
If Mitigated
Limited impact if proper input validation and output encoding are implemented elsewhere in the application stack.
🎯 Exploit Status
Deserialization vulnerabilities typically require specific payload construction but can be exploited remotely.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: >5.6.3.5
Vendor Advisory: https://patchstack.com/database/Wordpress/Theme/valenti/vulnerability/wordpress-valenti-theme-5-6-3-5-php-object-injection-vulnerability?_s_id=cve
Restart Required: No
Instructions:
1. Log into WordPress admin panel
2. Navigate to Appearance > Themes
3. Check Valenti theme version
4. Update to latest version if available
5. If no update available, replace with secure alternative theme
🔧 Temporary Workarounds
Disable Valenti Theme
allSwitch to a different WordPress theme immediately
wp theme activate twentytwentyfour
wp theme delete valenti
Input Validation Filter
allAdd custom PHP filter to sanitize serialized data inputs
Add custom filter in theme functions.php or plugin
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block deserialization attempts
- Restrict access to affected WordPress installations using IP whitelisting
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Appearance > Themes for Valenti theme version <=5.6.3.5Check Version:
wp theme list --field=name,status,version | grep valentiVerify Fix Applied:
Confirm Valenti theme version >5.6.3.5 or theme is deactivated/removed📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests containing serialized data
- PHP errors related to unserialize() function
Network Indicators:
- HTTP requests with serialized PHP objects in parameters
SIEM Query:
source="wordpress.log" AND ("unserialize" OR "O:" OR "a:" AND length>1000)