CVE-2026-19712: Unknown Masteriyo Lms

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Unknown Masteriyo Lms: before 2.3.3 (fixed in 2.3.3)

Published 2026-08-16. Last modified 2026-08-26.