The company uncovers evidence that at least three China-based hacking groups are abusing the zero-day flaw in SharePoint software to access servers.

Chinese state-sponsored hackers are actively exploiting critical security vulnerabilities in users of Microsoft's popular SharePoint servers to steal sensitive data and deploy malicious code, the US tech giant warned Tuesday.

At least 54 organizations have been breached in the attacks. Some of the attacks that targeted organizations using an exploit in Microsoft’s SharePoint server platform over the last few days have been linked to hacking groups affiliated with the Chinese government, according to a new Microsoft security blog.