The Contact Form Email WordPress plugin before 1.3.44 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/1b5fce7e-14fc-4548-8747-96fdd58fdd98