Wishlist for WooCommerce <= 1.1.3 - Insecure Direct Object Reference to Unauthenticated Wishlist Manipulation

The Wishlist for WooCommerce plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.1.3 via several functions in class-th-wishlist-frontend.php due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to modify other user's wishlists