The PeachPay — Payments & Express Checkout for WooCommerce (supports Stripe, PayPal, Square, Authorize.net, NMI) WordPress plugin before 1.120.70 does not perform any capability or ownership check before returning an order's secret key in response to an unauthenticated request, allowing anyone to retrieve the key for any paid order and use it to view that order's customer name, email address, postal address and contents.