PayPal Pay Now, Buy Now, Donation and Cart Buttons Shortcode <= 1.7 - 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=wpdev-paypal-button 2. For the “Business/Product Name” enter the payload "> 3. Save and see the XSS