The polyfill.io domain is being used to infect more than 100,000 websites with malware after a Chinese organization bought the domain earlier this year.

Multiple security firms sounded the alarm on Tuesday, warning organizations whose websites use any JavaScript code from the pollyfill.io domain to immediately remove it.

The site offered polyfills – useful bits of JavaScript code that add functionality to older browsers that is built into newer versions. These in-fills make life easier for developers in that by using polyfillers, they know their web code will work across a greater range of browsers.

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Source: The Register