The WP Review Slider WordPress plugin before 13.0 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/30f31412-8f94-4d5e-a080-3f6f669703cd/