Save as PDF by Pdfcrowd < 3.2.2 - 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 “Settings > Save as Image” 2. Toggle on “Expert Settings” 3. Multiple fields are vulnerable: “Custom Data”: "Custom CSS": “Data String”: `` 4. Save and see XSS