The attacks, discovered over the weekend, exploit a previously unknown vulnerability in the document-sharing software, prompting immediate action from both Microsoft and federal investigators. Newsweek reached out to Microsoft and the Cybersecurity and Infrastructure Security Agency (CISA) via email for comment.

Researchers say Chinese actors, along with other criminal hackers, exploited a security flaw in SharePoint software widely used by governments and businesses.

A series of cyberattacks targeting Microsoft collaboration software, specifically SharePoint, have been linked to Chinese hackers and threat actors.

The company said state-backed hacking groups were breaching systems through flaws in SharePoint, which is used by the U.S. government and companies around the world.

Identity of hackers behind cyberattack on SharePoint servers not yet known but they are believed to have exploited a vulnerability they were alerted to by a fix earlier this month

A global attack on Microsoft server software used by thousands of government agencies and businesses to share documents within organisations is likely the work of a single actor, a cybersecurity researcher said on Monday.

Hackers exploited a major security flaw in widely used Microsoft server software to launch a global attack on government agencies and businesses in the pas

U.S. National Nuclear Security Administration was among those breached by a hack of Microsoft's SharePoint document management software, Bloomberg News reported on Tuesday, citing a person with knowledge of the matter.