The Community Events WordPress plugin before 1.5.1 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/3d0a6edc-61e8-42fb-8b93-ef083146bd9c/