CVE-2025-69372: SevenHills Object Injection Vulnerability

CVE-2025-69372 Overview

A critical Deserialization of Untrusted Data vulnerability has been identified in the AncoraThemes SevenHills WordPress theme. This vulnerability allows attackers to perform PHP Object Injection attacks by exploiting insecure deserialization of user-controlled input. When successfully exploited, attackers can inject malicious serialized PHP objects that may lead to remote code execution, data manipulation, or complete site compromise.

Critical Impact

This vulnerability enables unauthenticated attackers to inject arbitrary PHP objects through the network without any user interaction, potentially resulting in full system compromise including unauthorized data access, integrity violations, and denial of service.

Affected Products

• AncoraThemes SevenHills WordPress Theme versions through 1.6.2
• WordPress installations using the SevenHills theme
• All sites with vulnerable SevenHills theme versions exposed to network access

Discovery Timeline

• 2026-02-20 - CVE CVE-2025-69372 published to NVD
• 2026-02-24 - Last updated in NVD database

Technical Details for CVE-2025-69372

Vulnerability Analysis

This vulnerability falls under CWE-502 (Deserialization of Untrusted Data), a well-documented weakness class that occurs when an application deserializes data from untrusted sources without proper validation. In the context of the SevenHills WordPress theme, the application processes serialized PHP data that can be manipulated by external actors.

PHP Object Injection vulnerabilities are particularly dangerous in WordPress environments because of the extensive class ecosystem available through WordPress core, plugins, and themes. When a malicious serialized object is processed, PHP's magic methods (such as __wakeup(), __destruct(), or __toString()) can be triggered, leading to unintended code execution paths known as "POP chains" (Property Oriented Programming).

The vulnerability requires no authentication or user interaction to exploit, making it accessible to any network-based attacker who can reach the vulnerable endpoint. Successful exploitation can result in complete compromise of confidentiality, integrity, and availability of the affected WordPress installation.

Root Cause

The root cause of this vulnerability is the insecure handling of serialized data within the SevenHills theme. The application uses PHP's unserialize() function or similar deserialization mechanisms on data that can be controlled by external users without implementing proper safeguards such as:

• Input validation to reject unexpected serialized data
• Allowlisting of expected object classes
• Signature verification of serialized payloads
• Use of safer serialization formats like JSON

When user-controlled serialized data reaches the deserialization function, attackers can craft malicious payloads containing arbitrary PHP objects that exploit available gadget chains in the WordPress ecosystem.

Attack Vector

The attack vector is network-based, requiring no privileges or user interaction. An attacker can exploit this vulnerability by:

1. Identifying the vulnerable deserialization endpoint in the SevenHills theme
2. Analyzing available PHP classes in the WordPress installation for exploitable magic methods
3. Crafting a malicious serialized payload containing objects that trigger dangerous operations when deserialized
4. Sending the crafted payload to the vulnerable endpoint
5. Achieving code execution or other malicious outcomes when the payload is processed

The vulnerability can be exploited by sending crafted HTTP requests containing malicious serialized PHP objects to the affected WordPress site. Upon deserialization, these objects can trigger existing "gadget chains" in the application codebase, potentially leading to arbitrary file operations, remote code execution, or database manipulation.

For detailed technical analysis, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-69372

Indicators of Compromise

• Unusual serialized data patterns in HTTP request parameters, particularly those containing O: prefixed strings indicating PHP objects
• Unexpected file modifications or new files created in the WordPress directory structure
• Anomalous database queries or modifications originating from theme-related functions
• Web server logs showing suspicious POST requests with serialized payloads targeting SevenHills theme endpoints
• Evidence of new administrator accounts or privilege escalation events

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block requests containing PHP serialized object patterns
• Monitor HTTP traffic for requests containing base64-encoded or URL-encoded serialized PHP data
• Deploy runtime application self-protection (RASP) solutions to detect deserialization attacks
• Review WordPress access logs for unusual request patterns to theme-specific endpoints
• Utilize intrusion detection systems (IDS) with signatures for PHP object injection attempts

Monitoring Recommendations

• Enable detailed logging for all HTTP requests to your WordPress installation
• Configure alerting for file system changes within the wp-content/themes/sevenhills/ directory
• Monitor for new user account creation or privilege changes
• Implement integrity monitoring on critical WordPress files and database tables
• Set up monitoring for outbound connections that may indicate post-exploitation activity

How to Mitigate CVE-2025-69372

Immediate Actions Required

• Update the SevenHills theme to the latest patched version immediately if available
• If no patch is available, consider temporarily deactivating and removing the SevenHills theme
• Review WordPress user accounts for any unauthorized additions or privilege escalations
• Scan the WordPress installation for signs of compromise including backdoors or webshells
• Implement WAF rules to block serialized PHP object patterns in incoming requests

Patch Information

Organizations should consult the Patchstack WordPress Vulnerability Report for the latest patch information and remediation guidance. Ensure the SevenHills theme is updated beyond version 1.6.2 when a security patch becomes available from AncoraThemes.

Workarounds

• Deploy a Web Application Firewall (WAF) with rules to block requests containing serialized PHP objects
• Implement input validation at the server level to reject requests with suspicious serialized data patterns
• Consider using a security plugin that provides virtual patching capabilities for WordPress vulnerabilities
• Restrict network access to WordPress admin areas and sensitive endpoints using IP allowlisting
• Temporarily switch to an alternative WordPress theme until a patched version of SevenHills is available

# WAF Rule Example - Block PHP Serialized Objects in Requests
# Add to .htaccess or ModSecurity configuration
SecRule REQUEST_BODY "@rx O:\d+:\"[^\"]+\":\d+:" \
    "id:100001,phase:2,deny,status:403,msg:'PHP Object Injection Attempt Blocked'"