Social Pixel <= 2.1 - 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. Go to: https://example.com/wp-admin/options-general.php?page=social-pixel 2. Under “Facebook” add the payload '); alert(2); console.log('blah for the “Identificador”. 3. Click the checkbox next to “Activación” 4. Save the settings and view the site to see the XSS