The Payment Page | Payment Form for Stripe plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'pricing_plan_select_text_font_family' parameter in all versions up to, and including, 1.4.6 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.