The Ninja Pages WordPress plugin through 1.4.2 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/0089f813-82fa-4ffc-acd6-a70e67edc8ea/