The Responsive Contact Form Builder & Lead Generation Plugin WordPress plugin through 1.8.9 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/33f6fea6-c784-40ae-a548-55d41618752d/