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CVE-2026-5167

MEDIUM 5.3 CVSS 3.1
Published
April 8, 2026
Last modified
July 24, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-639
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

Affected WordPress components

  • Masteriyo LMS – LMS Course Builder, Quizzes & Certificates Plugin · learning-management-system
    Confirmed match Active
    Up to and including 2.1.7
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • masteriyo Masteriyo LMS – Online Course Builder for eLearning, LMS & Education — Up to and including 2.1.7

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/learning-management-system/tags/2.1.4/addons/stripe/StripeAddon.php#L563-639
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/learning-management-system/tags/2.1.4/addons/stripe/StripeAddon.php#L649-704
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/learning-management-system/trunk/addons/stripe/StripeAddon.php#L563-639
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/learning-management-system/trunk/addons/stripe/StripeAddon.php#L649-704
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset/3499458/learning-management-system/trunk/addons/stripe/StripeAddon.php
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/b6d51dc3-b695-4e9d-b25a-d1b302be1fec?source=cve
  • nvd.nist.gov Official NVD record