The Quill Forms | The Best Typeform Alternative | Create Conversational Multi Step Form, Survey, Quiz, Cost Estimation or Donation Form on WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'quillforms-popup' shortcode in all versions up to, and including, 3.10.0 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.