The Watu Quiz WordPress plugin before 3.3.8.2 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).
https://wpscan.com/vulnerability/67d84549-d368-4504-9fa9-b1fce63cb967