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CVE-2026-20918 Microsoft CVE debrief

CVE-2026-20918 is a race condition vulnerability in Windows Management Services that allows an authorized attacker to elevate privileges locally. This vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. The CVE record was published on 2026-01-13T18:16:17.973Z and has not been modified since then. Affected products include various versions of Windows 10, Windows 11, and Windows Server. System administrators and security teams should prioritize patching and monitoring for this vulnerability. Evidence from NVD and Microsoft supports the existence of this vulnerability, but specific details about exploitation are limited.

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 Windows Management Services and related infrastructure should prioritize patching and monitoring for this vulnerability. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should also plan vendor-supported updates or mitigations through normal change control where exposure is confirmed and check relevant monitoring, detection, and logs for exposed assets that need extra review.

Technical summary

CVE-2026-20918 is a race condition vulnerability in Windows Management Services that allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. Affected products include various versions of Windows 10, Windows 11, and Windows Server. The vulnerability can be exploited by an authorized attacker with local access, indicating a high risk in environments where an attacker has local access.

Defensive priority

This vulnerability allows an authorized attacker to elevate privileges locally, indicating a high risk in environments where an attacker has local access. Immediate patching is recommended.

Recommended defensive actions

  • Apply patches from Microsoft for CVE-2026-20918
  • Conduct a thorough inventory of Windows Management Services usage
  • Implement compensating controls to limit local privilege escalation
  • Monitor for suspicious activity related to Windows Management Services
  • Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The CVE-2026-20918 record indicates a race condition vulnerability in Windows Management Services, which could allow an authorized attacker to elevate privileges locally. Evidence from NVD and Microsoft supports the existence of this vulnerability, but specific details about exploitation are limited.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-20918 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-20918

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

  • CVE-2026-20918 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-20918

    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.