CVE-2025-60237: Themeton Finag Object Injection Flaw

CVE-2025-60237 Overview

A critical deserialization of untrusted data vulnerability has been identified in the Themeton Finag WordPress theme. This vulnerability allows attackers to perform PHP Object Injection attacks, potentially leading to remote code execution, unauthorized data access, or complete system compromise. The vulnerability affects Finag theme versions through 1.5.0.

Critical Impact

Unauthenticated attackers can exploit this PHP Object Injection vulnerability to execute arbitrary code, manipulate data, or take complete control of affected WordPress installations.

Affected Products

• Themeton Finag WordPress Theme versions through 1.5.0

Discovery Timeline

• 2026-03-19 - CVE-2025-60237 published to NVD
• 2026-03-19 - Last updated in NVD database

Technical Details for CVE-2025-60237

Vulnerability Analysis

This vulnerability stems from insecure deserialization of user-controlled data within the Finag WordPress theme. PHP Object Injection vulnerabilities occur when an application deserializes untrusted data without proper validation, allowing attackers to inject malicious serialized objects.

When a PHP application uses unserialize() on attacker-controlled input, it can instantiate arbitrary objects with attacker-controlled properties. If the application contains classes with "magic methods" (such as __wakeup(), __destruct(), or __toString()) that perform sensitive operations, attackers can chain these methods to achieve code execution, file manipulation, or other malicious outcomes.

The vulnerability requires no authentication and can be exploited remotely over the network, making it particularly dangerous for publicly accessible WordPress sites using the Finag theme.

Root Cause

The root cause is the use of PHP's unserialize() function on untrusted user input without proper validation or sanitization. The Finag theme fails to implement secure deserialization practices, such as using json_decode() for data interchange or implementing allowlist-based filtering of acceptable classes during deserialization.

Attack Vector

The attack is executed remotely over the network without requiring authentication or user interaction. An attacker crafts a malicious serialized PHP object payload and submits it to a vulnerable endpoint in the Finag theme. Upon deserialization, the malicious object triggers a chain of method calls (known as a "POP chain" or Property-Oriented Programming chain) that ultimately executes arbitrary code or performs other unauthorized actions.

The exploitation typically involves identifying existing classes within WordPress core, the theme, or installed plugins that contain exploitable magic methods, then crafting a serialized payload that leverages these classes to achieve the desired malicious outcome.

Detection Methods for CVE-2025-60237

Indicators of Compromise

• Unusual serialized PHP data in HTTP request parameters, POST bodies, or cookies containing patterns like O: followed by class names
• Web server logs showing requests with encoded or obfuscated serialized PHP objects
• Unexpected file modifications or new files appearing in the WordPress installation
• Unusual process execution or outbound network connections originating from the web server

Detection Strategies

• Monitor web application firewall (WAF) logs for serialized PHP object patterns in incoming requests
• Implement file integrity monitoring to detect unauthorized changes to WordPress core, theme, and plugin files
• Deploy endpoint detection and response (EDR) solutions to identify anomalous process behavior on web servers
• Enable detailed PHP error logging to capture deserialization-related warnings or errors

Monitoring Recommendations

• Configure WordPress security plugins to alert on suspicious activity and login attempts
• Establish baseline behavior for the web server and alert on deviations such as unexpected outbound connections
• Monitor system logs for unusual PHP process activity or shell command execution
• Review web server access logs regularly for requests targeting theme-specific endpoints

How to Mitigate CVE-2025-60237

Immediate Actions Required

• Update the Finag WordPress theme to the latest patched version immediately if a patch is available
• If no patch is available, consider temporarily deactivating and switching to an alternative theme
• Implement a Web Application Firewall (WAF) rule to block requests containing serialized PHP object patterns
• Review WordPress installation for signs of compromise and restore from clean backups if necessary

Patch Information

Refer to the Patchstack Vulnerability Report for the latest patch status and remediation guidance from the vendor.

Workarounds

• Deploy a WAF rule to filter and block requests containing serialized PHP object patterns (e.g., regex matching O:[0-9]+:")
• Implement input validation at the server level to reject suspicious payloads before they reach the application
• Restrict access to the WordPress admin area and theme-specific endpoints using IP allowlisting
• Consider using a WordPress security plugin that provides virtual patching capabilities for known vulnerabilities

# Example WAF rule pattern for ModSecurity to block serialized PHP objects
# Add to your ModSecurity configuration
SecRule REQUEST_BODY "@rx O:[0-9]+:\"[a-zA-Z_]" \
    "id:100001,phase:2,deny,status:403,msg:'Blocked PHP Object Injection Attempt'"