The Icegram Engage WordPress plugin before 3.1.32 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/cbba8346-41f6-46ee-89ae-ed9524d768ef/