Gift Vouchers <= 4.4.0 is vulnerable to Cross Site Request Forgery (CSRF) vulnerability

The Gift Vouchers plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 4.4.0. This is due to missing or incorrect nonce validation on the create_default_pages function. This makes it possible for unauthenticated attackers to trigger the creation of default pages via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.