The Arigato Autoresponder and Newsletter WordPress plugin before 2.1.7.2 does not sanitize 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.
https://wpscan.com/vulnerability/e3771938-40b5-4e8b-bb5a-847131a2b4a7