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.
https://wpscan.com/vulnerability/1f1d7de5-cb7c-4440-b998-c6f15ecc6b4c/