The Download Manager WordPress plugin before 3.3.03 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/01193420-9a4c-4961-93b6-aa2e37e36be1/