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June 25, 2024, 10:17 p.m. |

Simon Willison's Weblog simonwillison.net

Polyfill supply chain attack hits 100K+ sites


Short version: if you are loading assets from the cdn.polyfill.io domain you need to remove that right now: the new owners of the domain (as of a few months ago) appear to be using it to serve malicious JavaScript.

polyfill.io was a fascinating service. It was originally developed and supported by the Financial Times, but span off as a separate project several years ago.


The key idea was to serve up a set …

cdn domain javascript loading security serve service supply chain supplychain you

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