The Donation Thermometer WordPress plugin before 2.1.3 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/97201998-1859-4428-9b81-9c2748806cf4