Ultimate WP Mail < 1.3.5 - Cross-Site Request Forgery

Description

The Ultimate WP Mail plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.3.4. This is due to missing or incorrect nonce validation on the save_email_lists() function. This makes it possible for unauthenticated attackers to update email lists via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.