PDF Builder for WPForms < 1.2.89 - Authenticated (Contributor+) Stored Cross-Site Scripting

Description

The PDF Builder for WPForms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'url' variable in versions up to, and including, 1.2.88 due to insufficient input sanitization and output escaping. 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.