Microsoft has pointed the finger at three Chinese nation-state actors. Here's what we know, plus how to guard against future attacks.

The tech giants have evidence that Chinese hackers are exploiting the new bug, but warned "multiple actors" are also hacking into affected SharePoint systems.

Security experts at Google and Microsoft have discovered that Chinese government-backed hackers are exploiting a serious flaw, known as a zero-day vulnerability, in Microsoft SharePoint, a tool used by many companies to store and share documents internally.