Reflected XSS and Open Redirect in Event Gallery Joomla Extension

Executive Summary

This is a reflected Cross-Site Scripting (XSS) and open redirect vulnerability in the Joomla Event Gallery extension versions before 6.5.0. The issue occurs because the 'return' parameter is base64-decoded and used directly in a 'Back' link without proper validation or sanitization.

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Detection Guidance

To detect this vulnerability, inspect Joomla sites using the Event Gallery extension version below 6.5.0. Check for reflected XSS via the 'return' parameter in URLs. Manually review links or use tools like Burp Suite to test parameter handling. No specific commands are provided in the context.

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Impact Analysis

An attacker could exploit this to execute malicious scripts in a user's browser when they click a crafted link, potentially stealing session cookies or sensitive data. It could also redirect users to malicious websites without their knowledge.

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Compliance Impact

This vulnerability could lead to unauthorized data access or disclosure, violating GDPR's data protection principles and HIPAA's security requirements for safeguarding sensitive information.

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Mitigation Strategies

Update the Event Gallery extension to version 6.5.0 or higher to address the reflected XSS and open redirect vulnerabilities.

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