Custom Twitter Feeds WordPress plugin before 2.2.3 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/29194dde-8d11-4096-a5ae-1d69c2c5dc33/