Nudgify Social Proof, Sales Popup & FOMO < 1.3.4 - Cross-Site Request Forgery via sync_orders_manually()

Description

The Nudgify Social Proof, Sales Popup & FOMO plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.3.3. This is due to missing or incorrect nonce validation on the sync_orders_manually() function. This makes it possible for unauthenticated attackers to sync orders via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.