The Smart Post Show WordPress plugin before 3.0.1 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/0e51b3b5-f003-4af9-8538-95f266065e36/