The Icegram Express WordPress plugin before 5.7.50 does not sanitise and escape some of its Template 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/f4e04f01-31cb-4f5e-9739-12f803600e60/