The Logo Slider WordPress plugin before 3.6.9 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/cfa67c43-6f09-43f5-9fbe-32a98a82f548/