The Simple File List WordPress plugin before 6.1.13 does not sanitise and escape a generated URL before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting which could be used against admins.
The Simple File List WordPress plugin before 6.0.10 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).