The AN_GradeBook WordPress plugin through 5.0.1 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/2504dadb-1086-4fa9-8fc7-b93018423515