The WP-Recall WordPress plugin before 16.26.12 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/c33adc08-99c5-42e1-a2e3-e7c3412a6a3f/