The Social Media Widget WordPress plugin before 4.0.9 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/7f8e5e63-a928-443e-9771-8b3f51f5eb9e/