The Survey Maker WordPress plugin before 4.2.9 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/175a9f3a-1f8d-44d1-8a12-e037251b025d/