Rede Itaú for WooCommerce < 5.4.7 - Unauthenticated Order Status Manipulation via PIX Webhook

The Rede Itaú for WooCommerce — Payment PIX, Credit Card and Debit WordPress plugin before 5.4.7 does not verify the authenticity of its PIX payment webhook before updating an order's status, allowing unauthenticated attackers to mark a pending order as paid without paying.