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CVE-2026-20865 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-01-13T18:16:15.797Z and has not been modified since then. The CVE-2026-20865 vulnerability is a use-after-free issue in Windows Management Services that can be exploited by an authorized attacker to elevate privileges locally. This vulnerability affects various versions of Windows 10, Windows 11, and Windows Server. The CVSS score for this vulnerability is 7.8, indicating a high severity level. System administrators and security teams responsible for managing Windows-based systems should be aware of this vulnerability and take immediate action to patch affected systems. Additionally, organizations that use Windows Management Services should prioritize patching to prevent potential exploitation.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-13
Original CVE updated
2026-07-30
Advisory published
2026-01-13
Advisory updated
2026-07-30

Who should care

System administrators and security teams responsible for managing Windows-based systems should be aware of this vulnerability and take immediate action to patch affected systems. Additionally, organizations that use Windows Management Services should prioritize patching to prevent potential exploitation.

Technical summary

The CVE-2026-20865 vulnerability is a use-after-free issue in Windows Management Services that can be exploited by an authorized attacker to elevate privileges locally. This vulnerability affects various versions of Windows 10, Windows 11, and Windows Server. The CVSS score for this vulnerability is 7.8, indicating a high severity level.

Defensive priority

This vulnerability allows an authorized attacker to elevate privileges locally, which can have a significant impact on the security of the affected systems. Therefore, it is essential to prioritize the patching of affected Windows systems.

Recommended defensive actions

  • Apply the vendor-provided patch for CVE-2026-20865
  • Ensure all affected Windows systems are updated with the latest security patches
  • Monitor systems for any suspicious activity related to this vulnerability
  • Perform regular vulnerability assessments to identify potential security risks
  • Implement compensating controls, such as access controls and intrusion detection systems

Evidence notes

The CVE-2026-20865 vulnerability is a use-after-free issue in Windows Management Services that can be exploited by an authorized attacker to elevate privileges locally. The affected products include various versions of Windows 10, Windows 11, and Windows Server. Microsoft has provided a vendor advisory for this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-20865 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-20865

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

  • CVE-2026-20865 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-20865

    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.