Hours after Microsoft revealed hacking groups affiliated with the Chinese government have been exploiting a flaw in its SharePoint software, Bloomberg News reports that the National Nuclear Security Administration has also been breached in the attacks.

Microsoft warned of "active attacks" targeting some users of its SharePoint software over the weekend and released an emergency patch that fixes only some versions of the vulnerable server software. Why it matters: It remains unclear how many businesses were already hacked prior to Microsoft's warning,

Microsoft 365 Defender now can automatically detect and disrupt "adversary-in-the-middle" (AiTM) attacks, Microsoft announced on Wednesday.. Such attacks might entail a phishing attempt that ...

Microsoft Defender 365 will fight attackers with their own tactics by locking down compromised systems automatically — including Linux servers.