The Watu Quiz WordPress plugin before 3.4.1.2 does not sanitise and escape some of its settings, which could allow users such as authors (if they've been authorized by admins) to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed.
https://wpscan.com/vulnerability/d46db635-9d84-4268-a789-406a0db4cccf/