WP Social Sharing <= 2.2 - Admin+ Stored XSS

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. Go to Settings » WP Social Sharing page of the plugin, enter the following payload into the input box named ‘Default share image’: x" onerror=“alert(/XSS/)” 2. Click ‘Save Changes’ and refresh the page to see the XSS popup.