The Quiz Maker WordPress plugin before 6.4.9.5 does not adequately authorize the `ays_quiz_author_user_search` AJAX action, allowing an unauthenticated attacker to perform a search for users of the system, ultimately leaking user email addresses.
The Quiz Maker WordPress plugin before 6.4.9.5 does not escape generated URLs before outputting them in attributes, leading to Reflected Cross-Site Scripting
The Quiz Maker WordPress plugin before 6.4.2.7 does not escape some parameters before outputting them back in attributes, leading to Reflected Cross-Site Scripting which could be used against high privilege users such as admin