The URL Shortify WordPress plugin before 1.7.9.1 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/9ec03ef0-0c04-4517-b761-df87af722a64