Chinese state-linked hackers secretly accessed email accounts at around 25 organisations, including government agencies, in a sweeping cyberespionage campaign by a group which primarily targets entities in Western Europe, Microsoft said on Wednesday.
"As with any observed nation-state actor activity, Microsoft has contacted all targeted or compromised organizations directly via their tenant admins and provided them with important information to help them investigate and respond," the statement added.
Microsoft did not say which organisations - or governments -had been affected by the digital intrusion.
White House National Security Council spokesman Adam Hodge said in a statement on Wednesday that an intrusion in Microsoft's cloud security had "affected unclassified systems", without elaborating.
"Officials immediately contacted Microsoft to find the source and vulnerability in their cloud service," he added.
China's Embassy in London did not immediately respond to an emailed request for comment. Beijing routinely denies that it engages in state-backed hacking campaigns.
Published 12 July 2023, 13:28 IST