CVE-2025-49072: Mr. Murphy Object Injection Vulnerability

CVE-2025-49072 Overview

CVE-2025-49072 is a critical Insecure Deserialization vulnerability affecting the Mr. Murphy WordPress theme developed by AncoraThemes. This PHP Object Injection flaw allows unauthenticated attackers to inject arbitrary objects into the application through the deserialization of untrusted data, potentially leading to remote code execution, privilege escalation, or complete site compromise.

Critical Impact

This vulnerability enables unauthenticated attackers to perform PHP Object Injection attacks against WordPress sites using the vulnerable Mr. Murphy theme, potentially resulting in complete site takeover without requiring any user interaction or authentication.

Affected Products

• Mr. Murphy WordPress Theme versions prior to 1.2.12.1
• WordPress installations utilizing the vulnerable AncoraThemes Mr. Murphy theme
• Any WordPress site with the Mr. Murphy theme installed and active

Discovery Timeline

• June 6, 2025 - CVE-2025-49072 published to NVD
• June 6, 2025 - Last updated in NVD database

Technical Details for CVE-2025-49072

Vulnerability Analysis

This vulnerability stems from CWE-502 (Deserialization of Untrusted Data), a critical security weakness where the application accepts serialized objects from untrusted sources and deserializes them without proper validation. In the context of the Mr. Murphy WordPress theme, the application fails to properly sanitize or validate serialized PHP data before processing it through PHP's unserialize() function.

When exploited, attackers can craft malicious serialized payloads that, upon deserialization, instantiate arbitrary PHP objects with attacker-controlled properties. By leveraging existing classes within WordPress core, installed plugins, or the theme itself that contain dangerous magic methods (such as __wakeup(), __destruct(), or __toString()), attackers can chain these "gadgets" to achieve arbitrary code execution.

The attack requires no authentication and can be performed remotely over the network, making it particularly dangerous for public-facing WordPress installations.

Root Cause

The root cause of CVE-2025-49072 is the unsafe deserialization of user-controllable input within the Mr. Murphy theme. The vulnerable code path accepts serialized PHP data without implementing proper input validation, type checking, or utilizing safer alternatives like JSON serialization. This architectural flaw allows attackers to manipulate the serialization stream to inject malicious object references.

PHP Object Injection vulnerabilities are particularly severe in WordPress environments due to the large codebase of WordPress core and commonly installed plugins, which often contain classes with exploitable magic methods that can be chained together to form "POP chains" (Property Oriented Programming chains).

Attack Vector

The vulnerability is exploitable via network-based attacks without requiring authentication. An attacker can submit a specially crafted serialized PHP payload through theme functionality that processes user input. The exploitation flow typically follows these steps:

1. Reconnaissance: Attacker identifies the target is running the vulnerable Mr. Murphy theme version
2. Payload Construction: Attacker identifies available gadget chains in the WordPress environment and constructs a malicious serialized payload
3. Payload Delivery: The crafted payload is submitted through the vulnerable input vector
4. Deserialization: The theme's vulnerable code deserializes the malicious payload
5. Exploitation: Magic methods in the instantiated objects execute, leading to arbitrary code execution

For detailed technical information about this vulnerability, refer to the Patchstack WordPress Vulnerability Database.

Detection Methods for CVE-2025-49072

Indicators of Compromise

• Unusual serialized data strings containing class names in web server access logs, particularly patterns like O:XX:"ClassName" in POST data or URL parameters
• Unexpected PHP errors related to object instantiation or magic method execution in error logs
• New or modified PHP files in theme directories that were not part of legitimate updates
• Unauthorized administrator accounts or unexpected privilege changes in WordPress
• Web shells or backdoor files appearing in WordPress directories

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block serialized PHP object patterns in incoming requests, specifically looking for O: prefixed strings followed by class definitions
• Monitor WordPress file integrity using tools that detect unauthorized modifications to theme files
• Implement log analysis to identify suspicious POST requests containing serialized data structures
• Use endpoint detection solutions to monitor for anomalous PHP process behavior indicating code execution

Monitoring Recommendations

• Enable detailed access logging on web servers and configure alerts for requests containing serialized PHP patterns
• Monitor WordPress database for unauthorized user creation or privilege escalation events
• Implement real-time file integrity monitoring for WordPress installations, particularly the wp-content/themes/mr-murphy/ directory
• Review PHP error logs regularly for deserialization-related exceptions or warnings

How to Mitigate CVE-2025-49072

Immediate Actions Required

• Update the Mr. Murphy theme to version 1.2.12.1 or later immediately through the WordPress admin dashboard or by downloading the patched version from the vendor
• If immediate patching is not possible, temporarily deactivate the Mr. Murphy theme and switch to a default WordPress theme
• Conduct a security audit of the WordPress installation to identify any signs of prior exploitation
• Review user accounts and remove any unauthorized administrator accounts that may have been created

Patch Information

AncoraThemes has addressed this vulnerability in Mr. Murphy theme version 1.2.12.1. Site administrators should update to this version or later to remediate the vulnerability. The patch information is available through the Patchstack security advisory.

Workarounds

• If patching is not immediately possible, implement WAF rules to block requests containing serialized PHP object patterns targeting the theme's endpoints
• Consider temporarily disabling the theme and using an alternative until the update can be applied
• Restrict access to the WordPress admin area and theme functionality using IP allowlisting where feasible
• Deploy a virtual patching solution through security plugins like Patchstack or Wordfence to provide interim protection

# Verify current Mr. Murphy theme version
grep -r "Version:" /path/to/wordpress/wp-content/themes/mr-murphy/style.css

# Check for potential indicators of compromise in access logs
grep -E "O:[0-9]+:\"" /var/log/apache2/access.log

# Temporarily disable the vulnerable theme via WP-CLI
wp theme deactivate mr-murphy --path=/path/to/wordpress
wp theme activate twentytwentyfour --path=/path/to/wordpress