The Request a Quote WordPress plugin before 2.4.1 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/75ad1d8f-edc3-4eb3-b4c0-73832c0a4ca0/