The Responsive Pricing Table WordPress plugin before 5.1.11 does not validate and escape some of its Pricing Table options before outputting them back in a page/post where the related shortcode is embed, which could allow users with the author role and above to perform Stored Cross-Site Scripting attacks
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)