Masteriyo LMS < 2.3.3 - Instructor+ Stored XSS via Quiz Description (CVE-2026-19712) | HOL Guard CVE

Medium · CVSS 6.1CVE-2026-19712

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

Answer in brief

CVE-2026-19712 records a Medium severity (CVSS 6.1) vulnerability in Masteriyo LMS < 2.3.3 - Instructor+ Stored XSS via Quiz Description. The current sources do not mark it as known exploited. The current feed maps Unknown/Masteriyo LMS (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 16, 2026Updated Aug 26, 2026Source checked Sep 30, 2026First seen by HOL Aug 16, 2026Material review Aug 26, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unknown/Masteriyo LMS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unknown/Masteriyo LMSgeneric	>=0 <2.3.3	2.3.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/Masteriyo LMS.
Review the reported fix. Update Unknown/Masteriyo LMS to 2.3.3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 16, 2026

Sources and claim methodology

Source referencewpscan.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.