Contact Form Plugin by Fluent Forms < 5.1.17 - Contributor+ Stored XSS

Description

The plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘subject’ parameter due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level permissions and above, and access granted by an administrator, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.