A massive cyber-espionage campaign has compromised nearly 400 organizations globally by exploiting a critical vulnerability in Microsoft SharePoint servers. Eye Security researchers discovered the ongoing attacks,

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.

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.