The Carousel Slider WordPress plugin before 2.2.7 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/23805a61-9fcd-4744-a60d-05c8cb43ee01/