The SULly WordPress plugin before 4.3.1 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/1ede4c66-9932-4ba6-bba1-0ba13f5a2f8f/