Recently a supply chain attack was discovered for the domain cdn dot polyfill dot io which was a popular service for the distribution of an open source library polyfill.js. According to sansec.io, this attack effected over 100,000 sites which involved cdn dot polyfill dot io injecting malware on mobile devices. So what happened in the polyfill.io attack? Polyfill is a service that provides a piece of Javascript code that allows modern functionality on older browsers that do not natively suppo...
