The Gianism WordPress plugin through 5.1.0 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/3c114e14-9113-411d-91f3-2e2daeb40739/