More than 100K sites impacted by Polyfill supply chain attack
Polyfill.js is a popular open-source project that provides modern functionality on older browsers that do not support it natively; users embed it using the cdn.polyfill.io domain. On February 24, 2024, a Chinese company named Funnull acquired both the domain and the Github account. Following that acquisition, the developer, Andrew Betts, tweeted on his X account a warning for all of his service’s users urging them to remove any reference to polyfill from their code.