The Simple File List WordPress plugin before 4.4.12 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/b57272ea-9a8a-482a-bbaa-5f202ca5b9aa