Integration for Contact Form 7 and Salesforce <= 1.3.3 is vulnerable to Open Redirection vulnerability

The Integration for Contact Form 7 and Salesforce plugin for WordPress is vulnerable to Open Redirect in versions up to, and including, 1.3.3. This is due to insufficient validation on a user-supplied parameter. This makes it possible for unauthenticated attackers to redirect users to potentially malicious sites if they can successfully trick them into performing an action.