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PatchSiren cyber security CVE debrief

CVE-2026-49167 Microsoft CVE debrief

CVE-2026-49167 is a Use after free vulnerability in Windows Kernel. An authorized attacker can exploit this vulnerability to elevate privileges locally. The vulnerability has a CVSS score of 4.7 and a severity of MEDIUM. Microsoft has released a patch for this vulnerability. The vulnerability affects Windows 10, Windows 11, and Windows Server systems. System administrators and users of these systems should be aware of this vulnerability and apply the necessary patches. The CVE record and NVD entry provide additional context, but defenders should verify the affected scope and severity to ensure proper mitigation.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
MEDIUM 4.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-16
Advisory published
2026-07-14
Advisory updated
2026-07-16

Who should care

System administrators and users of Windows 10, Windows 11, and Windows Server systems should be aware of this vulnerability and apply the necessary patches. Additionally, security teams and vulnerability management teams should review the official advisory and CVE record to validate affected scope, severity, and vendor guidance. Defenders should also verify the affected scope and severity to ensure proper mitigation and review compensating controls for exposed systems.

Technical summary

The vulnerability exists in the Windows Kernel and allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 4.7 and a severity of MEDIUM. Microsoft has released a patch for this vulnerability. The affected products include Windows 10, Windows 11, and Windows Server systems. To mitigate this vulnerability, defenders should apply the patch released by Microsoft and ensure that all Windows systems are up-to-date with the latest security patches. Monitoring system logs for potential exploitation attempts is also recommended.

Defensive priority

Medium

Recommended defensive actions

  • Apply the patch released by Microsoft
  • Ensure that all Windows systems are up-to-date with the latest security patches
  • Monitor system logs for potential exploitation attempts
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-14T17:16:51.493Z and was last modified on 2026-07-16T16:16:50.887Z. The NVD entry is currently Analyzed. The vulnerability exists in the Windows Kernel and allows an authorized attacker to elevate privileges locally. Microsoft has released a patch for this vulnerability. However, the specific details about the vulnerability, such as its root cause, are not provided in the CVE record or NVD entry. To verify the affected scope and severity, defenders should review the official advisory and CVE record. The NVD entry provides additional information, but its accuracy and completeness depend on the analysis performed.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T17:16:51.493Z and has not been modified since then. The NVD entry is currently Analyzed.