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CVE-2026-45653 Microsoft CVE debrief

CVE-2026-45653 is a HIGH severity vulnerability in the Windows Kernel. It is a use-after-free vulnerability that allows an authorized attacker to elevate privileges locally. The vulnerability was published on 2026-06-09T17:17:32.287Z and modified on 2026-06-11T18:54:22.730Z. The CVSS score is 7. The vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-07-09
Advisory published
2026-06-09
Advisory updated
2026-07-09

Who should care

Administrators and users of Windows 10, Windows 11, and Windows Server should be aware of this vulnerability. An authorized attacker could exploit this vulnerability to elevate privileges locally.

Technical summary

The vulnerability is a use-after-free vulnerability in the Windows Kernel. This type of vulnerability occurs when a program uses memory after it has been freed. An attacker could exploit this vulnerability to execute arbitrary code in the context of the kernel, allowing for a local elevation of privileges.

Defensive priority

High

Recommended defensive actions

  • Apply patches from Microsoft as soon as possible.
  • Ensure that all Windows systems are up to date with the latest security patches.
  • Consider implementing additional security measures such as multi-factor authentication and monitoring for suspicious activity.

Evidence notes

The vulnerability was published by Microsoft and has a CVSS score of 7. The vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45653 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45653

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-45653 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45653

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.