SolarWinds hackers accessed Microsoft source code, the company says


The hacking group behind the SolarWinds compromise was able to break into Microsoft and access some of its source code, Microsoft said on Thursday, something experts said sent a worrying signal about the spies’ ambition.

Source code — the underlying set of instructions that run a piece of software or operating system— is typically among a technology company’s most closely guarded secrets and Microsoft has historically been particularly careful about protecting it.

It is not clear how much or what parts of Microsoft’s source code repositories the hackers were able to access, but the disclosure suggests that the hackers who used software company SolarWinds as a springboard to break into sensitive U.S. government networks also had an interest in discovering the inner workings of Microsoft products as well.

Microsoft had already...

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