Masteriyo LMS < 3.4.1 - Instructor+ Stored XSS via Course Highlights (CVE-2026-82847) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-82847

Masteriyo LMS < 3.4.1 - Instructor+ Stored XSS via Course Highlights

Answer in brief

CVE-2026-82847 records a Unknown severity vulnerability in Masteriyo LMS < 3.4.1 - Instructor+ Stored XSS via Course Highlights. 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 Sep 12, 2026Updated Sep 12, 2026Source checked Sep 12, 2026First seen by HOL Sep 12, 2026Material review Sep 12, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. 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 <3.4.1	3.4.1

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/Masteriyo LMS.
Review the reported fix. Update Unknown/Masteriyo LMS to 3.4.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 12, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 12, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 12, 2026

Sources and claim methodology

Source referencewpscan.com

Upstream source description

The Masteriyo LMS WordPress plugin before 3.4.1 does not sanitise and escape one of its course fields before outputting it back in the course editor, allowing users with the instructor role to perform Stored Cross-Site Scripting attacks against higher privileged users such as administrators.

Quoted source text, attributed separately from HOL analysis.