The Button contact VR WordPress plugin through 4.7 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/fe8c001e-8880-4570-b010-a41fc8ee0c58/