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Shortly after Microsoft announced support for custom JavaScript functions in Excel, someone demonstrated what could possibly go wrong if this feature is abused for malicious purposes.

As promised last year at Microsoft’s Ignite 2017 conference, the company has now brought custom JavaScript functions to Excel to extend its capabilities for better work with data.

Functions are written in JavaScript for Excel spreadsheets currently runs on various platforms, including Windows, macOS, and Excel Online, allowing developers to create their own powerful formulae.

But we saw it coming:

images from Hacker News