Email Verification for WooCommerce <= 1.8.1 - Authentication Bypass

The Email Verification for WooCommerce plugin for WordPress is vulnerable to Authentication Bypass due to insufficient validation on the alg_wc_ev_activation_code value found in the verify() function which makes it possible for users to spoof email validation for any user, including administrators, that will auto-log them in as that user through wp_set_auth_cookie(). This affects versions up to, and including, 1.8.1. This makes it possible for unauthenticated attackers to log in as site administrators.