The Get your number WordPress plugin through 1.1.3 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/1df111aa-6057-47a2-8e8b-9ef5ec3bb472