Polyfill.io Supply Chain Attack: Widespread Compromise Affects Over 100,000 Websites

Summary:

A significant supply chain attack on the Polyfill.io JavaScript library, affecting over 100,000 websites. A Chinese company acquired the domain in February 2024 and embedded malicious code, redirecting users to harmful sites. Despite mitigation efforts, many websites remain compromised. The incident underscores the need for vigilant security practices in managing third-party dependencies.

Threat Level – Red | Attack Report