The Login rebuilder WordPress plugin before 2.8.1 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/7b356b82-5d03-4f70-b4ce-f1405304bb52
http://packetstormsecurity.com/files/173726/WordPress-Login-Rebuilder-Cross-Site-Scripting.html