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.

Missing Authorization vulnerability in quillforms.com Quill Forms allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Quill Forms: from n/a through 3.3.0.

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Quillforms Quill Forms allows Stored XSS.This issue affects Quill Forms: from n/a through 3.7.0.