Microsoft addresses severe vulnerability affecting multiple products. Organizations must apply security updates immediately to prevent potential exploitation.
Microsoft has released critical security updates addressing CVE-2026-39824, a vulnerability that could allow remote code execution on affected systems. The vulnerability carries a CVSS score of 9.8, indicating critical severity.
The vulnerability exists in the Microsoft Windows Common Log File System Driver. Successful exploitation could allow an attacker to execute arbitrary code with elevated privileges. No user interaction is required for exploitation.
Affected products include:
- Windows 10 (all versions released after May 2021)
- Windows 11 (all versions)
- Windows Server 2022
- Windows Server 2019
- Windows Server 2016
Microsoft has released security updates as part of the December 2025 Security Updates. Organizations should prioritize deployment of these updates immediately.
Mitigation steps:
- Apply the security updates immediately
- Enable automatic updates where possible
- Restrict network access to affected systems
- Monitor for unusual system behavior
The vulnerability was discovered by security researchers at Mitsui Bussan Secure Directions during joint research with Microsoft. No known public exploits are currently available.
For detailed information about the vulnerability, refer to the Microsoft Security Advisory. Additional technical details are available in the Security Update Guide.
Organizations experiencing issues with the updates should contact Microsoft Support through the Microsoft Security Response Center.
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