Unauthenticated PHP Object Injection in CleanSkin

Executive Summary

This is an unauthenticated PHP Object Injection vulnerability in the CleanSkin WordPress theme versions up to 1.5.0. Attackers can exploit it to manipulate data processing and execute harmful server actions without needing authentication.

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Detection Guidance

Detecting this vulnerability requires checking if the CleanSkin theme version 1.5.0 or older is installed on your WordPress site. Inspect the theme's version in the WordPress admin panel under Appearance > Themes or via file system checks for the theme directory.

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Impact Analysis

Attackers can exploit this flaw to take control of your website, steal sensitive data, or perform other malicious actions without any user interaction. The high CVSS score of 9.8 indicates a severe risk of widespread exploitation.

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Compliance Impact

This vulnerability could lead to unauthorized data access or manipulation, which may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information. Unauthenticated PHP Object Injection may allow attackers to execute malicious actions on the server, potentially exposing sensitive data.

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Mitigation Strategies

Immediately apply the mitigation rule provided by Patchstack to block attacks. If possible, update the CleanSkin theme to a patched version. If no patch is available, consider temporarily switching to a different theme or seeking help from a developer or hosting provider.

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