Authorization Bypass in Masteriyo LMS WordPress Plugin

Executive Summary

The vulnerability exists in the Masteriyo LMS – LMS Course Builder, Quizzes & Certificates plugin for WordPress, affecting all versions up to and including 2.2.1.

It is an authorization bypass issue caused by the plugin not properly verifying whether a user is authorized to perform certain actions.

This flaw allows authenticated users with student-level access or higher to modify the description (post content) of any course announcements authored by instructors or administrators.

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Impact Analysis

An attacker with at least student-level access can exploit this vulnerability to alter course announcement content that should only be modifiable by instructors or administrators.

This could lead to misinformation being spread to students or other users, potentially damaging the integrity and trustworthiness of the course content.

Although the vulnerability does not impact confidentiality or availability, it does affect the integrity of course announcements.

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Compliance Impact

The vulnerability allows authenticated users with student-level access or higher to modify course announcement descriptions authored by instructors or administrators due to improper authorization checks.

However, there is no specific information provided about how this vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.

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Mitigation Strategies

The vulnerability exists in all versions of the Masteriyo LMS plugin up to and including 2.2.1 due to improper authorization checks.

To mitigate this vulnerability, immediately update the Masteriyo LMS plugin to a version later than 2.2.1 where the authorization bypass issue is fixed.

Additionally, restrict user roles to minimize the number of users with student-level access or higher until the update is applied.

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