CVE-2026-19712
Received Received - Intake

Stored XSS in Masteriyo LMS WordPress Plugin

Publication date: 2026-08-16

Last updated on: 2026-08-16

Assigner: WPScan

Description
The Masteriyo LMS WordPress plugin before 2.3.3 does not sanitise and escape a quiz field before outputting it back in a page, and grants its instructor role the ability to store unfiltered HTML, allowing such users to perform Stored Cross-Site Scripting attacks against any visitor of the affected page, including administrators. This affects default single-site installations. Sites running multisite, or defining DISALLOW_UNFILTERED_HTML, are not affected as the capability is not granted there.

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Meta Information

Published
2026-08-16
Last Modified
2026-08-16
Generated
2026-08-16
AI Q&A
2026-08-16
EPSS Evaluated
N/A
NVD
CVE-2026-19712
EUVD
EUVD-2026-59915

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
masteriyo masteriyo_lms to 2.3.3 (exc)

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 versions before 2.3.3. It occurs because the plugin does not properly sanitize and escape a quiz field before displaying it on a page. This allows users with the instructor role to inject malicious scripts that execute when others, including administrators, view the page.

Detection Guidance

To detect this vulnerability, check if the Masteriyo LMS plugin version is below 2.3.3. Log in to your WordPress admin panel, go to Plugins, and verify the installed version. Alternatively, use WP-CLI with the command: wp plugin list | grep masteriyo_lms. If the version is outdated, the system is vulnerable.

Impact Analysis

An attacker with instructor access could inject malicious scripts to steal cookies, session tokens, or sensitive data from other users. Administrators viewing the affected page could have their accounts compromised, leading to full site takeover. The scripts could also deface the website or redirect users to malicious sites.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR's data protection requirements. For HIPAA, it may expose protected health information if exploited. Compliance failures could result in legal penalties, fines, or reputational damage due to compromised data integrity and confidentiality.

Mitigation Strategies

Immediately update the Masteriyo LMS plugin to version 2.3.3 or later. If updating is not possible, consider disabling the plugin temporarily until an update is applied. Ensure your WordPress installation is configured as a multisite or has DISALLOW_UNFILTERED_HTML defined to prevent unfiltered HTML storage.

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