The Floating Chat Widget WordPress plugin before 3.1.2 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/f9f8ae7e-6621-4e29-9257-b8306dbe8811