The Social Media Share Buttons & Social Sharing Icons WordPress plugin before 2.9.1 does not sanitize 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/701f653b-a0c3-49b4-972e-f26c3633ad92/