The Masteriyo LMS – Online Course Builder for eLearning, LMS & Education plugin for WordPress is vulnerable to Authorization Bypass Through User-Controlled Key in versions up to and including 2.1.7. This is due to insufficient webhook signature verification in the handle_webhook() function. The webhook endpoint processes unauthenticated requests and only performs signature verification if both the webhook_secret setting is configured AND the HTTP_STRIPE_SIGNATURE header is present. Since webhook_secret defaults to an empty string, the webhook processes attacker-controlled JSON payloads without any verification. This makes it possible for unauthenticated attackers to send fake Stripe webhook events with arbitrary order_id values in the metadata, mark any order as completed without payment, and gain unauthorized access to paid course content.
CVE-2026-5167 is a medium severity with CVSS 5.3 Authorization Bypass issue affecting the Plugin Masteriyo LMS – LMS Course Builder, Quizzes & Certificates. It affects Versions up to 2.1.7 and is fixed in 2.1.8.
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CVE-2026-5167 is tracked for the Plugin Masteriyo LMS – LMS Course Builder, Quizzes & Certificates as medium severity with CVSS 5.3. The affected range is Versions up to 2.1.7. Update Masteriyo LMS – LMS Course Builder, Quizzes & Certificates to 2.1.8 or newer where that version is compatible with the site.
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Affected version data gives operators a concrete comparison point against installed WordPress software.
A fixed version is present, so the page can answer update and remediation intent directly.
External references are available for source validation, advisory review, and incident notes.
Use these checks when converting this record into a patch ticket, incident note, or risk acceptance decision.
Inventory the installed Plugin package and compare its version with Versions up to 2.1.7.
Confirm Masteriyo LMS – LMS Course Builder, Quizzes & Certificates is updated to 2.1.8 or newer.
Review references and CVSS vector details for exploitability, authentication requirements, and exposure path.
After patching, re-run vulnerability monitoring and keep the related plugin or theme hub under review for follow-up CVEs.
| Software Type | Plugin |
|---|---|
| Software Slug |
learning-management-system
View on wordpress.org
|
| CVE | CVE-2026-5167 |
| Patched Versions |
2.1.8
|
| Affected Versions |
Versions up to 2.1.7
|
These internal links group the same WordPress plugin by CVE, issue type, severity, and patch status so operators and search engines can connect the full vulnerability cluster.
Masteriyo - LMS <= 1.7.2 - Unauthenticated Privilege Escalation
Masteriyo LMS – LMS Course Builder, Quizzes & Certificates <= 2.2.0 - Authenticated (Subscriber+) Privilege Escalation
Masteriyo LMS <= 2.1.6 - Missing Authorization to Authenticated (Student+) Privilege Escalation to Administrator
Masteriyo LMS – eLearning and Online Course Builder for WordPress <= 1.13.3 - Authenticated (Student+) Missing Authorization to Privilege Escalation
Masteriyo - LMS for WordPress <= 1.6.7 - Sensitive Information Exposure
Masteriyo - LMS <= 1.18.3 - Authenticated (Contributor+) Stored Cross-Site Scripting
Masteriyo LMS – eLearning and Online Course Builder for WordPress <= 1.13.3 - Authenticated (Student+) Stored Cross-Site Scripting via Ask a Question Functionality
Masteriyo LMS – LMS Course Builder, Quizzes & Certificates <= 2.1.8 - Missing Authorization
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