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Masteriyo LMS - Cross-Site Scripting (XSS) (CVE-2026-82846)

CVE-2026-82846

Vulnerability CVE-2026-82846 PLUGIN masteriyo-lms MEDIUM

The Masteriyo LMS WordPress plugin before 3.4.0 does not sanitise and escape some course settings before outputting them in a page available to all visitors, allowing users with a course-author role to perform Stored Cross-Site Scripting attacks that run in the session of anyone viewing the course, including a logged-in administrator.

CVE-2026-82846

MEDIUM CVSS 6.8 Published 2026-09-05 Updated 2026-09-08
AI Risk Elevated (58/100) Active Exploit: No strong signal Published Exploit: No public exploit references Priority: P3 Priority
Severity Band MEDIUM
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
Affected Components 1
Reference Links 1
AI Risk Engine Elevated (58/100)
Exploitability Medium
Active Exploitation No strong signal
Published Exploit Status No public exploit references

Threat Timeline

  1. 2026-09-05 CVE published and first recorded in the threat feed.
  2. 2026-09-08 Record updated with latest vulnerability metadata.
  3. 2026-09-07 AI technical context refreshed for mitigation and impact guidance.
  4. Now Monitoring for follow-up changes, linked references, and new related CVEs.

AI Context

Machine-generated threat intelligence

AI Updated 33 days ago

AI enriched 33 days ago (2026-09-07 07:04 UTC)

Technical Summary

The Masteriyo LMS WordPress plugin before 3.4.0 does not sanitise and escape some course settings before outputting them in a page available to all visitors, allowing users with a course-author role to perform Stored Cross-Site Scripting attacks that run in the session of anyone viewing the course, including a logged-in administrator.

Potential Impact

Severity is MEDIUM (CVSS 6.8). Depending on deployment context, affected components may be exposed to unauthorized actions or data integrity risk.

Exploitability Assessment

Exploitability is assessed as Medium based on severity and technical exposure profile.

Primary risk drivers: severity and technical exposure profile

Mitigation Recommendations

Validate affected product versions, prioritize patching, and monitor references for vendor remediation guidance. If immediate patching is not possible, apply compensating controls and limit exposure of vulnerable surfaces.

Detection & Monitoring

Track authentication anomalies, unexpected file writes, and suspicious plugin API activity around affected components.

Business Impact Lens

AI risk score 58/100 (Elevated, Medium) with priority P3 Priority. Prioritize remediation where affected components process customer data, admin sessions, or Internet-exposed workflows.

Affected Products

Masteriyo LMS PLUGIN · masteriyo-lms Affected: < 3.4.0 Fixed in: 3.4.0

Related Vulnerabilities

Browse All Threats

Newest linked vulnerabilities to keep visitors exploring adjacent CVE coverage.

Masteriyo LMS - Security Vulnerability (CVE-2026-82850) CVE-2026-82850 Published 2026-09-24 Masteriyo LMS - Security Vulnerability (CVE-2026-82849) CVE-2026-82849 Published 2026-09-24 Masteriyo LMS - Security Vulnerability (CVE-2026-82845) CVE-2026-82845 Published 2026-09-12 Masteriyo LMS - Security Vulnerability (CVE-2026-82847) CVE-2026-82847 Published 2026-09-12 Masteriyo LMS - Security Vulnerability (CVE-2026-82851) CVE-2026-82851 Published 2026-09-12 Masteriyo - LMS - Security Vulnerability (CVE-2026-62132) CVE-2026-62132 Published 2026-09-11

References

What to do about this

Patch on your next cycle Worth fixing, but not ahead of other work.

Fix it

Update Masteriyo LMS to 3.4.0 or later.

That is the complete fix. Everything below is what protects you in the meantime.

Cannot update today? Request / payload inspection (WAF) in Hack Halt ProSecure blocks this class of attack before WordPress processes the request.

Inspect request parameters and bodies for injection, traversal and file-inclusion payloads, and refuse the request rather than logging it.

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Not sure if you are affected?

Scan your site to see whether it runs Masteriyo LMS, and at which version.

Free, no installation, no account. It reads what your site already publishes, then tells you which plugins carry known vulnerabilities and what to do about each one.

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Am I affected by this vulnerability?

You are affected if your site runs Masteriyo LMS. Versions below 3.4.0 are vulnerable; that release and later are not.

How do I fix it?

Update Masteriyo LMS to version 3.4.0 or later. That is the complete fix. Until you can update, Request / payload inspection (WAF) in Hack Halt ProSecure contains this class of attack at the request layer.

What can an attacker actually do?

This is a Cross-Site Scripting (XSS) flaw. An attacker who exploits it can run script in a visitor's browser, stealing sessions or planting an administrator account.

WordPress security that blocks attacks before they land.

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