Two Chinese nation-state actors and one China-based threat actor have tried to exploit the vulnerability for weeks, Microsoft said.

Microsoft issued an emergency fix to close off a vulnerability in its SharePoint software that hackers have exploited to carry out widespread attacks on businesses and at least some federal agencies.The software giant on Saturday said it was aware of "active attacks" that exploited vulnerabilities in the program,

Microsoft is following up and is also releasing a patch for the 2016 edition of Sharepoint. Admins should install this immediately.