Masteriyo LMS <= 2.1.7 - Unauthenticated Authorization Bypass to Arbitrary Order Completion via Stripe Webhook Endpoint
| CVE | CVE-2026-5167 |
|---|---|
| CVSS | 5.3 (Medium) |
| Publicly Published | April 7, 2026 |
| Last Updated | April 8, 2026 |
| Researcher |
Md. Moniruzzaman Prodhan (NomanProdhan)
- Knight Squad
|
Description
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.
References
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
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Vulnerability Details for Masteriyo LMS – LMS Course Builder, Quizzes & Certificates
| Software Type | Plugin |
|---|---|
| Software Slug | learning-management-system (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 2.1.8, or a newer patched version |
| Affected Version |
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| Patched Version |
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Recent vulnerabilities in Masteriyo LMS – LMS Course Builder, Quizzes & Certificates
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