Mastercard is ignoring a critical flaw that allows hackers to spoof valid payments [Update]

Vendors relying on Mastercard’s Internet Gateway Service (MIGS) for processing online payments ought to double-check every transaction before they send out items to customers: There is a critical flaw in the system’s validation protocol and it appears the company is completely ignoring it. Independent security researcher Yohanes Nugroho has stumbled upon a glaring flaw in the MIGS protocol that allows hackers to spoof the payment system and trick merchants into accepting invali