Subscriber PHP Object Injection in RealHomes

Executive Summary

CVE-2026-56055 is a high-priority PHP Object Injection vulnerability found in the WordPress RealHomes Theme versions 4.5.3 and earlier.

This vulnerability allows attackers to inject malicious PHP objects, which can lead to various attacks such as code injection, SQL injection, path traversal, and denial of service if a suitable Property-Oriented Programming (POP) chain exists.

It is classified under the OWASP Top 10 category A3: Injection and is actively targeted in mass-exploit campaigns, making it a significant threat to websites using the affected theme.

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Detection Guidance

The vulnerability in the WordPress RealHomes Theme (versions 4.5.3 and earlier) is a PHP Object Injection flaw that can be exploited remotely. Detection typically involves monitoring for exploit attempts targeting this specific theme version.

Since the vulnerability is actively targeted in mass-exploit campaigns, network or system detection can focus on identifying suspicious HTTP requests attempting to exploit PHP Object Injection or related injection vectors.

Patchstack recommends applying mitigation rules to block attacks until the theme is updated. These rules can be used in Web Application Firewalls (WAFs) or intrusion detection systems to detect and block exploit attempts.

Specific commands are not provided in the available resources, but general approaches include:

• Using web server logs to search for unusual POST or GET requests containing serialized PHP objects or suspicious payloads targeting RealHomes theme endpoints.
• Employing tools like grep or similar to scan access logs for known exploit patterns or payload signatures.
• Implementing WAF rules from Patchstack or other security providers that detect and block PHP Object Injection attempts.
• Monitoring for unexpected code execution, SQL injection attempts, or path traversal activities that may indicate exploitation.

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Impact Analysis

This vulnerability can have severe impacts including unauthorized code execution, data breaches through SQL injection, unauthorized file access via path traversal, and service disruption through denial of service attacks.

Such impacts can compromise the confidentiality, integrity, and availability of your website and its data.

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Compliance Impact

The CVE-2026-56055 vulnerability in the RealHomes WordPress theme allows for PHP Object Injection, which can lead to code execution, SQL injection, path traversal, and denial of service attacks. Such exploitation could result in unauthorized access, data breaches, or service disruptions.

These outcomes can negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require the protection of personal and sensitive data, as well as maintaining system integrity and availability.

Failure to address this vulnerability could lead to violations of these regulations due to potential data exposure or service interruptions.

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Mitigation Strategies

Immediate action is required to mitigate the risk posed by the PHP Object Injection vulnerability in RealHomes Theme versions 4.5.3 and earlier.

• Update the RealHomes theme to version 4.5.4 or later.
• Apply the mitigation rule provided by Patchstack to block attacks until the update can be applied.

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