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      <title>CVE-2026-5167 — Masteriyo LMS &lt;= 2.1.7 - Unauthenticated Authorization Bypass to Arbitrary Order Completion via Stripe Webhook Endpoint</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-5167</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Masteriyo LMS – Online Course Builder for eLearning, LMS &amp;amp; Education&lt;/p&gt;
&lt;p&gt;The Masteriyo LMS – Online Course Builder for eLearning, LMS &amp;amp; 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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Masteriyo LMS – Online Course Builder for eLearning, LMS &amp;amp; Education&lt;/p&gt;
&lt;p&gt;The Masteriyo LMS – Online Course Builder for eLearning, LMS &amp;amp; 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.&lt;/p&gt;</content:encoded>
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