Unauthenticated URL Redirection in MasterStudy LMS WordPress Plugin

Executive Summary

The MasterStudy LMS WordPress Plugin before version 3.7.43 has an unauthenticated open redirect vulnerability. During user registration, the plugin does not validate a redirect parameter, allowing attackers to send users to any external website without authentication.

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Detection Guidance

To detect this vulnerability, check if your WordPress site uses the MasterStudy LMS plugin version prior to 3.7.43. Inspect the user registration page for unvalidated redirect parameters in URLs. Look for suspicious external redirects during registration attempts.

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Impact Analysis

This vulnerability can trick users into visiting malicious websites, leading to phishing attacks, malware downloads, or credential theft. Users may unknowingly expose sensitive information if they follow the malicious redirect.

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Compliance Impact

This vulnerability could lead to data breaches or unauthorized access, violating GDPR and HIPAA requirements for protecting user data. Organizations using the vulnerable plugin may face compliance penalties and reputational damage.

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Mitigation Strategies

Immediately update the MasterStudy LMS plugin to version 3.7.43 or later. If updating is not possible, consider disabling the plugin until the update is applied. Monitor user registration logs for unusual redirect activities.

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