Google & Microsoft Warn of Chinese Hackers Exploiting SharePoint Zero‑Day
Microsoft and Google jointly raise cybersecurity concerns over a SharePoint zero-day exploit tied to Chinese state-backed groups Linen and Violet Typhoon.

Google, Microsoft say Chinese Hackers are Exploiting SharePoint Zero-day

TECHi's Author Fatimah Misbah Hussain
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Fatimah Misbah Hussain
Fatimah Misbah Hussain
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The SharePoint zero-day attack is just another ugly reminder that in the digital era, even the most secure platforms are vulnerable to being easy targets when used with precision and timing. Microsoft’s SharePoint is the main pillar of internal document management for thousands of companies, and that is precisely the reason this attack is so threatening.

It’s not a matter of stealing information, rather it’s about opening the eyes of such confident companies that have blind trust in their core tech infrastructure. What’s most disturbing is the coordinated basics of this exploitation, which is apparently linked to several Chinese state-sponsored groups.

This attack reveals not only a weakness in the software itself, but in the industry’s reactive attitude towards patching and threat detection. Zero-day exploits are by definition difficult to defend against. The fact that hackers were already taking advantage of this vulnerability prior to Microsoft even having a chance to act, indicates just how rapidly the balance can shift in favor of the malicious actors.

Corporate IT teams, particularly those with self-hosted SharePoint servers, are at this point in crisis. They are battling the possibility that their systems were already breached before they even had knowledge of the bug. Meanwhile, diplomatic representatives, especially from China, continue to reject any type of involvement and are not taking any responsibility. This is a complicated issue of attribution in cyberspace.

Numerous individuals continue to undervalue how intertwined cybersecurity is with day to day life, until it’s their medical records, email accounts, or intellectual property that end up in the crosshairs. The SharePoint zero-day attack is not just another random news front-page, rather it’s a very alarming situation. It demonstrates to us the much demanding necessity for firms to invest in cyber resilience, governments to set more definite global standards of digital behavior, and for the tech sector to craft swifter and sharper defenses. 

Techcrunch

Techcrunch

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Security researchers at Google and Microsoft say they have evidence that hackers backed by China are exploiting a zero-day bug in Microsoft SharePoint, as companies around the world scramble to patch the flaw. The bug, known officially as CVE-2025-53770 and discovered last weekend, allows hackers to steal sensitive private keys from self-hosted versions of SharePoint, a software server widely used by companies and organizations to store and share internal documents. Once exploited, an attacker can use the bug to remotely plant malware and gain access to the files and data stored within, as well as gain access to other systems on the same network. In a blog post on Tuesday, Microsoft said it had observed at least two previously identified China-backed hacking groups it calls “Linen Typhoon” and “Violet Typhoon” exploiting the SharePoint zero-day. Microsoft says Linen Typhoon is focused on stealing intellectual property, while Violet Typhoon steals private information to be used for espionage.

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