URL Shortify < 1.12.2 - Unauthenticated Open Redirect via 'redirect_to' Parameter

Description

The URL Shortify plugin for WordPress is vulnerable to Open Redirect in all versions up to, and including, 1.12.1 due to insufficient validation on the 'redirect_to' parameter in the promotional dismissal handler. This makes it possible for unauthenticated attackers to redirect users to potentially malicious sites via a crafted link.