Last year, the Department of Homeland Security released a scathing report detailing Microsoft’s mistakes during a 2023 hack in which China stole thousands of emails from top government officials. Two years before that, China-linked cyberattackers compromised more than 250,000 Microsoft Exchange servers.

Chinese "threat actors" have hacked some Microsoft SharePoint servers and targeted the data of the businesses using them, the firm has said.

Microsoft recently patched two major flaws in SharePoint on-prem instances, but the effects could be long-lasting.