The HL Twitter WordPress plugin through 2014.1.18 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/cbab7639-fdb2-4ee5-b5ca-9e30701a63b7/