CVE-2026-19712

Masteriyo LMS < 2.3.3 - Instructor+ Stored XSS via Quiz Description

Published Aug 16, 2026 CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Masteriyo
Masteriyo masteriyo
Wordpress
Wordpress wordpress
Vendors & Products Masteriyo
Masteriyo masteriyo
Wordpress
Wordpress wordpress
Type Values Removed Values Added
Weaknesses CWE-79
Type Values Removed Values Added
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.
Title Masteriyo LMS < 2.3.3 - Instructor+ Stored XSS via Quiz Description
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
WPScan
Published
Updated
Aug 17, 2026, 8:01 PM
Reserved
Aug 13, 2026, 11:05 AM
Status
Deferred
Published
Aug 16, 2026, 6:16 AM
Modified
Aug 26, 2026, 4:30 PM