Microsoft Corp. said a Chinese hacking group is exploiting security vulnerabilities in the company’s SharePoint servers to deploy ransomware, following a cyberattack discovered last week that has affected hundreds of entities around the world.

South Africa’s National Treasury is among at least 400 entities worldwide to be affected by a hack of Microsoft’s SharePoint document management system.

Microsoft warned users that hackers used a security flaw in its server software to attack government agencies and businesses around the world. The federal government, along with those in Canada and Australia, has launched an investigation into the hack that targeted SharePoint servers, The Washington Post reported.

A major global hack targeting Microsoft’s SharePoint platform affects U.S. and other nations, exposing sensitive data.

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 major cyberespionage operation targeting Microsoft's SharePoint server software has compromised about 100 organizations worldwide. The operation exploits a zero-day vulnerability, allowing hackers to install backdoors on affected servers.

Microsoft Corp. has determined that China-linked hacking groups are targeting deployments of its SharePoint file sharing platform. The company detailed its findings in a blog post published today.

The U.S. National Nuclear Security Administration (NNSA), the agency responsible for maintaining Americas nuclear weapons arsenal, was reportedly affected by a cyberattack targeting Microsofts (NASDAQ: MSFT)

Microsoft has released security updates addressing the exploited vulnerabilities and urged all customers to apply patches without delay.