Microsoft hack: White House warns of 'active threat' of email attack

Microsoft said hackers had used its mail server to attack their targets. Ms Psaki told reporters that the White House was "Concerned that there are a large number of victims" and said the vulnerabilities found in Microsoft's servers "Could have far reaching impacts". Microsoft executive Tom Burt revealed the breach in a blog post on Tuesday and announced updates to counter security flaws which he said had allowed hackers to gain access to Microsoft Exchange servers. Microsoft has not confirmed the reported figures but said in a further statement on Friday that it was working closely with US government agencies and told customers "The best protection" was "To apply updates as soon as possible across all impacted systems". Although Hafnium is based in China, it allegedly conducts its operations primarily from leased virtual private servers in the US, Microsoft said.

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