Unauthenticated Stored XSS in YOOtheme Zoo Extension

Executive Summary

This is an unauthenticated stored cross-site scripting (XSS) vulnerability in the Joomla Extension Zoo from yootheme.com. User-controlled input in comments and custom fields was not properly escaped, allowing malicious scripts to be stored and executed when other users view the page.

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Detection Guidance

This vulnerability involves stored XSS in Joomla's Zoo extension versions before 4.1.66. To detect it, inspect user comments and custom fields in Zoo for unsanitized input. Check extension version with: grep -r 'Zoo' /path/to/joomla/extensions. Look for stored payloads like <script> tags in database fields.

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Impact Analysis

An attacker could exploit this to inject malicious scripts into web pages viewed by other users. This could lead to session hijacking, defacement, or theft of sensitive data like cookies or credentials if users interact with the compromised content.

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Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR's data protection principles and HIPAA's security requirements for safeguarding protected health information. Organizations may face compliance violations if user data is compromised.

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Mitigation Strategies

Immediately update the Zoo extension to version 4.1.66 or later. If updating is not possible, disable the Zoo extension or restrict user input fields. Review and sanitize all stored user-generated content in comments and custom fields.

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