The Simple Share WordPress plugin through 0.5.3 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/89ccbe24-be15-4b13-883a-48d6da9c8ffa/