Unauthenticated PHP Object Injection in EmallShop

Detection Guidance

The vulnerability affects the WordPress EmallShop Theme versions 2.4.21 and below, involving unauthenticated PHP Object Injection. Detection typically involves monitoring for suspicious HTTP requests attempting to exploit PHP Object Injection vectors targeting the theme.

While no specific detection commands are provided in the available resources, general approaches include inspecting web server logs for unusual POST or GET requests containing serialized PHP objects or payloads attempting code injection.

Additionally, applying the mitigation rule provided by Patchstack can help block exploit attempts until the theme is updated.

For practical detection, you might consider using network monitoring tools or web application firewalls (WAFs) configured to detect or block PHP Object Injection patterns targeting EmallShop theme endpoints.

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Executive Summary

CVE-2026-39443 is a high-priority PHP Object Injection vulnerability found in the WordPress EmallShop Theme versions 2.4.21 and below.

This flaw allows unauthenticated attackers to inject malicious PHP objects, potentially enabling code execution, SQL injection, path traversal, denial of service, and other harmful actions if a suitable POP (Property Oriented Programming) chain exists.

It is classified under the OWASP Top 10 category A3: Injection, indicating it is a serious injection vulnerability.

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Impact Analysis

This vulnerability can have severe impacts including unauthorized code execution, which may lead to full system compromise.

• Execution of arbitrary code on the affected server.
• SQL injection attacks that could expose or manipulate sensitive data.
• Path traversal attacks that might allow attackers to access restricted files.
• Denial of service conditions that could disrupt website availability.

Because the vulnerability is exploitable without authentication and has a high severity score (8.1), it poses a significant risk to websites using the vulnerable theme, regardless of their size or popularity.

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Mitigation Strategies

Immediate action is advised to mitigate the PHP Object Injection vulnerability in EmallShop versions 2.4.21 and below.

• Update the EmallShop theme to version 2.4.22 or later.
• Apply the mitigation rule issued by Patchstack to block attacks until the update is applied.
• Seek assistance from your hosting provider or developers if needed.
• Consider using automated vulnerability mitigation solutions offered by Patchstack to keep your website secure.

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Compliance Impact

The vulnerability in EmallShop versions 2.4.21 and below allows unauthenticated PHP Object Injection, which can lead to code execution, SQL injection, path traversal, and denial of service attacks.

Such security weaknesses can compromise the confidentiality, integrity, and availability of data, potentially leading to unauthorized access or data breaches.

Consequently, organizations using vulnerable versions may face challenges in maintaining compliance with data protection standards and regulations like GDPR and HIPAA, which require safeguarding personal and sensitive information against unauthorized access and ensuring system security.

Immediate mitigation and patching are advised to reduce the risk of exploitation and help maintain compliance.

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