The Sunshine Photo Cart WordPress plugin before 3.7 does not validate that a client-supplied price identifier belongs to the item being purchased when it is added to the cart, allowing unauthenticated users to buy items at a lower price defined elsewhere on the site and complete an order at that price, resulting in financial loss for the site owner.
https://wpscan.com/vulnerability/81201a99-0fbd-494a-9d65-b285a2172224/