The National Security Agency has discovered a major security flaw in Microsoft's Windows 10 operating system that could allow hackers to intercept seemingly secure communications.

Microsoft says the NSA notified the company about it. 

Microsoft released a free software patch Tuesday.

It credits the NSA for discovering it.

The company says it hasn't seen any evidence that hackers have used the technique.

One expert says this is a good example of the “constructive role” that the NSA can play in improving global information security.

Some computers will get the update automatically if they have the option turned on.

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