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CVE-2026-20867 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-01-13T18:16:16.130Z and has not been modified since then. CVE-2026-20867 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. Microsoft has provided patches and updates to address this vulnerability. System administrators and security teams should prioritize patching and monitoring to mitigate the risk of local privilege escalation attacks. The CVE details indicate a race condition vulnerability in Windows Management Services, which could allow an authorized attacker to elevate privileges locally.

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, particularly those using Windows Management Services, should prioritize patching and monitoring to mitigate the risk of local privilege escalation attacks.

Technical summary

CVE-2026-20867 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. Microsoft has provided patches and updates to address this vulnerability.

Defensive priority

This vulnerability allows an authorized attacker to elevate privileges locally, indicating a high risk for systems that are not properly patched.

Recommended defensive actions

  • Apply patches or updates provided by Microsoft to address the vulnerability in Windows Management Services.
  • Ensure that all affected systems are inventoried and prioritized for remediation based on risk and exposure.
  • Implement compensating controls, such as restricting access to sensitive areas of the system, until patches can be applied.
  • Monitor system logs for suspicious activity that could indicate exploitation attempts.
  • Verify that Windows Management Services is properly configured and secured.

Evidence notes

The CVE-2026-20867 record indicates a race condition vulnerability in Windows Management Services, which could allow 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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-20867 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-20867

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

  • CVE-2026-20867 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-20867

    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.