Vulnerability · Published Aug 16, 2026 · Assigned by WPScan

CVE-2026-19712Masteriyo LMS < 2.3.3 - Instructor+ Stored XSS via Quiz Description

Medium 6.1

In plain English

A medium-severity cross-site scripting in Masteriyo LMS from Unknown. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.3%top 83.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Unknown	Masteriyo LMS	0 – before 2.3.3

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

https://wpscan.com/vulnerability/08c31101-ee38-46e9-b451-abb1ed70079c/ exploit, vdb-entry, technical-description