Chinese "threat actors" have hacked Microsoft's SharePoint document software servers and targeted the data of the businesses using it, the firm has said.

Microsoft has accused Chinese state-sponsored groups of exploiting its SharePoint document management software to target users including large corporations and government agencies. The US software giant said on Tuesday that two groups — Linen Typhoon and Violet Typhoon — had exploited a so-called spoofing vulnerability to attack servers used by Microsoft customers.