CVE-2026-82846
Received Received - Intake

Stored Cross-Site Scripting in Masteriyo LMS WordPress Plugin

Publication date: 2026-09-05

Last updated on: 2026-09-05

Assigner: WPScan

Description
The Masteriyo LMS WordPress plugin before 3.4.0 does not sanitise and escape some course settings before outputting them in a page available to all visitors, allowing users with a course-author role to perform Stored Cross-Site Scripting attacks that run in the session of anyone viewing the course, including a logged-in administrator.

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Meta Information

Published
2026-09-05
Last Modified
2026-09-05
Generated
2026-09-05
AI Q&A
2026-09-05
EPSS Evaluated
N/A
NVD
CVE-2026-82846
EUVD
EUVD-2026-71857

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
masteriyo masteriyo_lms to 3.4.0 (exc)
masteriyo masteriyo_lms From 1.18.0 (inc) to 2.3.3 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the Masteriyo LMS WordPress plugin. It occurs because the plugin does not properly sanitize and escape certain course settings before displaying them on a page accessible to all visitors. This allows users with the 'course-author' role to inject malicious scripts that execute in the browsers of anyone viewing the course, including logged-in administrators.

Detection Guidance

Check the installed version of the Masteriyo LMS plugin. If it is between 1.18.0 and 2.3.3, the system is vulnerable. Use WordPress admin panel or run a command like 'wp plugin list' in the WordPress directory to verify the version.

Impact Analysis

This vulnerability can allow attackers with the 'course-author' role to inject malicious scripts into course pages. When other users, including administrators, view these pages, the scripts can execute in their browsers, potentially stealing session cookies, performing actions on their behalf, or redirecting them to malicious sites.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, which may violate GDPR's data protection requirements or HIPAA's privacy rules. If exploited, it could result in data breaches, unauthorized data access, or other compliance violations depending on the data processed by the plugin.

Mitigation Strategies

Update the Masteriyo LMS plugin to version 3.4.0 or later immediately. Remove or restrict the 'course-author' role permissions temporarily until the update is applied to prevent potential exploitation.

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