Chinese Hackers Exploit SharePoint Vulnerability!

In a shocking revelation, cybersecurity experts from Google and Microsoft have confirmed that hackers with ties to China are actively exploiting a dangerous zero-day vulnerability in Microsoft SharePoint. This alarming discovery has sent shockwaves across companies globally, forcing them to rush to patch the flaw before it's too late.

What is the Zero-Day Bug?

The vulnerability, identified as CVE-2025-53770, was uncovered just last weekend. It enables cybercriminals to steal sensitive private keys from self-hosted SharePoint servers—a platform that organizations use to store and share crucial internal documents. Once this flaw is exploited, hackers can remotely inject malware, gain unauthorized access to valuable files, and even infiltrate other systems within the same network.

Who's Behind the Attacks?

In a compelling blog post, Microsoft revealed that two notorious China-backed hacking groups, dubbed "Linen Typhoon" and "Violet Typhoon," have been leveraging this zero-day exploit. While Linen Typhoon focuses on stealing critical intellectual property, Violet Typhoon aims to gather sensitive information for espionage purposes.

Additionally, Microsoft identified another group known as "Storm-2603," which is less known but has been linked to previous ransomware attacks.

Timeline of Exploitation

According to Microsoft, these malicious actors have been exploiting this vulnerability to infiltrate vulnerable SharePoint servers since July 7—long before it was publicly acknowledged.

The Impact on Organizations!

Charles Carmakal, the CTO of Google’s Mandiant incident response team, warned that at least one of the responsible groups is indeed linked to Chinese interests. Multiple actors are now exploiting this critical vulnerability, which has led to a growing number of attacks on various organizations, including those in the government sector.

Patch Released, But Risks Remain!

Although Microsoft has rolled out patches for all affected SharePoint versions, security researchers caution that organizations operating self-hosted versions should be on high alert, as they might have already been compromised.

Chinese Government's Response?

Interestingly, the Chinese Embassy in Washington, D.C., has yet to respond to requests for comments on this cybersecurity issue. Historically, the Chinese government has denied involvement in cyberattacks, although their denials have not always been unequivocal.

Stay Alert and Secure!

As the situation unfolds, it's crucial for organizations to implement security measures and stay informed about potential threats. Cybersecurity is more important than ever, and these recent developments serve as a wake-up call for all.