The Page Builder: Pagelayer WordPress plugin before 1.9.0 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/acddcf33-0a18-499e-b42d-c8b49f2c4de5/