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

A sweeping cyber espionage operation targeting Microsoft server software compromised about 100 organizations as of the weekend, two of the organizations that helped uncover the campaign said.

Microsoft's SharePoint software is under active attacks, posing a threat to businesses and governments worldwide due to a vulnerability allowing unauthenticated system access.