Stored Cross-Site Scripting in Masteriyo LMS WordPress Plugin

Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) issue in the Masteriyo LMS WordPress plugin before version 3.4.1. It occurs because the plugin does not properly sanitize and escape a course field before displaying it in the course editor. This allows users with the instructor role to inject malicious scripts that target higher-privileged users like administrators.

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Detection Guidance

To detect this vulnerability, check if your WordPress site uses the Masteriyo LMS plugin version prior to 3.4.1. Log in as an instructor and inspect course fields in the editor for unusual or malicious scripts. Review browser console logs for any unexpected script executions when editing courses.

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Impact Analysis

If exploited, this vulnerability could allow an attacker with the instructor role to inject malicious scripts into the course editor. These scripts could then be executed by higher-privileged users such as administrators, potentially leading to unauthorized actions, data theft, or further compromise of the WordPress site.

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Compliance Impact

This vulnerability could impact compliance with GDPR and HIPAA by potentially exposing sensitive user data or administrative actions. If exploited, it may lead to unauthorized access or data breaches, violating privacy and security requirements under these regulations.

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Mitigation Strategies

Immediately update the Masteriyo LMS plugin to version 3.4.1 or later. If updating is not possible, consider disabling the plugin temporarily until an update is applied. Review user roles and permissions to ensure instructors do not have unnecessary privileges.

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