The LearnPress WordPress plugin before 4.4.7 does not restrict the correctness flags it returns when a quiz answer is checked, allowing unauthenticated attackers to obtain the correct answer to every option of a question, along with the instructor's explanation, on courses configured to be taken without enrolling.
https://wpscan.com/vulnerability/20004b72-69f5-406f-b1e6-e88f6f6ffae7/