How MageCart Attackers Bypassed Payment Fraud Detection at MyPillow

MageCart attackers compromised MyPillow.com's checkout between October and November 2018, injecting malicious JavaScript to steal credit card data before it reached payment processors. The client-side interception bypassed traditional fraud detection systems designed to monitor processed transactions. The attack exploited gaps in content security policies and client-side script validation that were commonplace in 2018 e-commerce infrastructure.