The Poll Maker WordPress plugin before 5.5.4 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/05d5010b-94eb-4fd3-b962-e2a16c032b71/