Critical Vulnerability in Microsoft SharePoint Server: What You Need to Know
A critical security vulnerability identified in Microsoft SharePoint Server, CVE-2025-53770, is currently being exploited in a widespread attack that allows unauthorized code execution. With a CVSS score of 9.8, it exposes on-premises SharePoint systems to severe risks.
Key Details
- Who: Microsoft and Viettel Cyber Security
- What: A zero-day vulnerability enabling remote code execution.
- When: Discovered and publicly announced on July 19, 2025.
- Where: Affects on-premises SharePoint Server; SharePoint Online is unaffected.
- Why: Attackers leverage deserialization of untrusted data to execute commands before authentication.
- How: By exploiting this flaw, attackers can gain unauthorized access and move laterally within the network, often camouflaging their activities.
Why It Matters
This vulnerability has severe implications for:
- Enterprise Security: It allows attackers to bypass standard authentication, potentially compromising sensitive data across multiple organizations, including government entities.
- Hybrid Cloud Adoption: Companies using a mixed environment could face challenges securing on-premises resources, affecting their cloud strategy.
- Compliance and Risk Management: Organizations must act swiftly to mitigate risks or face potential compliance violations.
Takeaway for IT Teams
IT professionals should immediately enable Antimalware Scan Interface (AMSI) integration in their SharePoint environments and deploy Defender AV to minimize exposure until a patch is released. It’s also advisable to disconnect impacted servers from the internet if AMSI cannot be enabled. Continuous monitoring and rapid incident response are crucial during this ongoing threat landscape.
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