WP Courses is a Wordpress plugin allowing to define courses with lessons. The course can be: - accessible to everyone without authentication; - only available for logged-in users; - only available for logged-in and paying users. In the latter case, only when a user is registered to WordPress and has bought the product via a third plugin (for example WooCommerce) the contents of the lessons are shown. We have stumbled upon a severe information disclosure vulnerability on WP Course <= 2.0.29 that gives an unauthenticated attacker the ability to exfiltrate all the content of courses (for example videos links, etc...) through the Wordpress REST API (/wp-json). We have published more details and a root cause analysis in the following link: https://www.redtimmy.com/critical-information-disclosure-on-wp-courses-plugin-exposes-private-course-videos-and-materials/ A CVE has been requested but not assigned yet.