The Crelly Slider WordPress plugin through 1.4.5 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/e738540a-2006-4b92-8db1-2476374d35bd/