Widget for Social Page Feeds < 6.4 - Admin+ Stored XSS

Description The plugin 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)

PoC

1. Create a new Facebook like widget. 2. When creating a new widget, insert the following payload in the “Custom CSS” field: background-color: pink; height: 500px;" onmouseover="alert(/XSS/)" 3. Save and load the site. Move your mouse over the pink box in the widget area and see the XSS pop-up.