CVE-2026-5167

01/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.

02/References6

• plugins.trac.wordpress.org/browser/learning-management-system/t…
• plugins.trac.wordpress.org/browser/learning-management-system/t…
• plugins.trac.wordpress.org/browser/learning-management-system/t…
• plugins.trac.wordpress.org/browser/learning-management-system/t…
• plugins.trac.wordpress.org/changeset/3499458/learning-managemen…
• www.wordfence.com/threat-intel/vulnerabilities/id/b6d51dc3-b695…