SharePoint Breach Sends Shockwaves through Global Cybersecurity

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Source: Bitdenfender

A recent critical vulnerability in Microsoft SharePoint has triggered widespread concern across security teams worldwide. The flaw, tracked as CVE-2025-53770, allows unauthenticated attackers to execute remote code through malicious ViewState payloads. The exploit has already been used in active attacks targeting institutions in energy, education, and government sectors.

The breach campaign appears to have started in early July. Microsoft confirmed that threat actors were able to steal cryptographic machine keys and drop persistent web shells on vulnerable systems. Several Chinese-based groups, including Violet Typhoon and Storm-2603, are suspected to be involved in the exploitation [1].

Microsoft released emergency patches for supported SharePoint Server editions on July 20. However, the company urged organizations to go beyond simple patching. Machines may remain compromised unless full incident response actions are performed. This includes key rotation, forensic scans, and configuration reviews [2].

CISA and other agencies have also published detailed guidance. They recommend isolating vulnerable SharePoint servers, hunting for suspicious .aspx files, and inspecting for unusual ViewState activity from mid-July onward [3].

If your organization still runs on-premise SharePoint, now is the time to act. Apply all updates, rotate secrets, and conduct thorough threat hunts. Even patched systems may be harboring dormant implants.

This incident underscores a growing truth—legacy systems with internet exposure are often the weakest link in organizational security.

References

[1] Microsoft, “Disrupting active exploitation of on-premises SharePoint vulnerabilities,” Microsoft Security Blog, Jul. 22, 2025. [Online]. Available: https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/

[2] AP News, “What to know about a vulnerability being exploited on Microsoft SharePoint servers,” Jul. 22, 2025. [Online]. Available: https://apnews.com/article/65ebcae88267e1aa375013adaa283765

[3] CISA, “Microsoft Releases Guidance on Exploitation of SharePoint Vulnerabilities,” Jul. 20, 2025. [Online]. Available: https://www.cisa.gov/news-events/alerts/2025/07/20/update-microsoft-releases-guidance-exploitation-sharepoint-vulnerabilities

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