Authenticated Stored XSS in YOOtheme Pro Joomla Extension

Executive Summary

This is an authenticated, privileged stored cross-site scripting (XSS) vulnerability in YOOtheme Pro versions 1.0.0 to 5.0.41. It occurs due to a lack of proper escaping in the location custom field, allowing attackers with privileges to inject malicious scripts that execute in the context of other users.

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Detection Guidance

This vulnerability involves authenticated stored XSS in YOOtheme Pro versions 1.0.0-5.0.41 due to improper escaping in the location custom field. To detect it, inspect Joomla sites using YOOtheme Pro within the affected version range for suspicious JavaScript in location fields or user input handling.

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Impact Analysis

An attacker could exploit this to steal sensitive user data, perform unauthorized actions on behalf of users, or deface the website. Since it requires authentication and privileged access, the risk is higher for users with elevated permissions.

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Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality principles or HIPAA's security requirements. Organizations may face compliance violations and potential fines if exploited.

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Mitigation Strategies

Immediately update YOOtheme Pro to the latest version beyond 5.0.41. If updating is not possible, disable the location custom field or restrict authenticated user privileges to reduce attack surface. Monitor for unusual activity in user input fields.

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