The Plugin Oficial WordPress plugin through 1.7.3 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/5a296b59-f305-49a2-88b8-fca998f2c43e/