Thousands of popular websites have been compromised in the last few months that utilise the polyfill library for older browser support.

This is a developing story as the details of which are only just being discovered now, so certain details may change or may not be entirely telling of the whole situation, but in the interest of getting attention on this here is a quick explanation of what is going on.

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Article:
https://sansec.io/research/polyfills...

Websites using cdn:
https://publicwww.com/websites/%22cdn...