The Quizlord WordPress plugin through 2.0 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/4cbce79d-9b7a-41f5-9c52-08933ea7c28e