Ninja Forms < 3.15.5 - Unauthenticated Stored XSS via Paragraph Text (RTE) Field

Description

The plugin is vulnerable to Stored Cross-Site Scripting via Paragraph Text fields due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is only exploitable when the targeted Paragraph Text field has the Rich Text Editor (RTE) option enabled.