The Short URL WordPress plugin before 1.6.5 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/6e167864-c304-402e-8b2d-d47b5a3767d1