The Responsive Pricing Table WordPress plugin before 5.1.8 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/dfde5436-dd5c-4c70-a9c2-3cb85cc99c0a
https://portswigger.net/web-security/cross-site-scripting/stored