Microsoft Servers Breached by Chinese Cyber Groups, Urgent Security Updates Issued

Wed Jul 23 2025 23:47:11 GMT+0300 (Eastern European Summer Time)
Microsoft Servers Breached by Chinese Cyber Groups, Urgent Security Updates Issued

Microsoft has confirmed that its SharePoint document software servers have been compromised by Chinese cyber threat groups, prompting an urgent warning for businesses using on-premises systems.


The recent cybersecurity breach has raised significant concerns as Microsoft's SharePoint software was targeted by the China state-backed groups Linen Typhoon and Violet Typhoon, along with the hacker collective Storm-2603. The attackers exploited vulnerabilities in on-site SharePoint servers, which are frequently used by organizations, while cloud-based services remained unaffected. Microsoft has responded by releasing critical security updates and strongly recommending that all on-premises SharePoint server users implement these patches to safeguard against further attacks.

In an official statement, Microsoft expressed high confidence that the hackers will continue to exploit systems that do not install its security updates. The tech giant has promised to provide ongoing updates regarding the investigation on its blog. Reports indicated that the attackers gained unauthorized access to sensitive materials by sending malicious requests, enabling the theft of encryption keys from the SharePoint servers. Charles Carmakal, CTO of Mandiant Consulting, noted that various sectors across the globe have fallen victim to these breaches, primarily affecting governmental and business entities that utilize SharePoint.

Carmakal emphasized the opportunistic nature of the attacks, which occurred before a security patch was available, thereby underscoring the threat's significance. He detailed that Linen Typhoon has been primarily involved in intellectual property theft for over a decade, targeting governmental, defense, and human rights organizations. Violet Typhoon has focused on espionage against ex-government officials, NGOs, think tanks, and other entities in the U.S., Europe, and East Asia, while Storm-2603 is deemed to pose a potential threat with ties to Chinese cyber operations.

As concerns mount, Microsoft finds itself addressing multiple challenges, including significant layoffs and ongoing legal matters regarding software pricing in the UK. The sector continues to grapple with the implications of cyber threats, emphasizing the need for robust cybersecurity measures for firms and governments alike.

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