At least two Chinese hacking groups were using security flaws in SharePoint, a popular collaboration software, to breach systems, Microsoft said.

Microsoft Corp. warned that hackers are actively targeting customers of its document management software SharePoint, with security researchers flagging the risk of potentially widespread breaches around the world.

"Investigations into other actors also using these exploits are still ongoing," Microsoft said in a statement. The firm said it had "high confidence" the hackers would continue to target systems which have not installed its security updates.