The Everest Forms WordPress plugin before 3.0.4.2 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/85d590c9-c96d-40c9-aa59-48302ba3d63c/