The Float to Top Button WordPress plugin through 2.3.6 does not 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/1c551234-9c59-41a0-ab74-beea2d27df6b