The Tutor LMS WordPress plugin before 2.2.1 does not implement adequate permission checks for REST API endpoints, allowing unauthenticated attackers to access information from Lessons that should not be publicly available.
https://wpscan.com/vulnerability/3b6969a7-5cbc-4e16-8f27-5dde481237f5
https://wordpress.org/plugins/tutor/
https://plugins.trac.wordpress.org/browser/tutor/tags/2.2.0/classes/RestAPI.php#L253