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CVE-2026-26174 Microsoft CVE debrief

A race condition vulnerability in Windows Server Update Service allows an authorized attacker to elevate privileges locally. Multiple Windows versions and server releases are affected. This vulnerability requires verification of affected versions and deployment of vendor patches. The vulnerability has a high CVSS score of 7, indicating a significant risk to affected systems. Defenders and administrators should assess exposure and apply patches immediately. The CVE record and NVD detail page provide information on the vulnerability, including its description, CVSS score, and affected systems.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-14
Original CVE updated
2026-09-25
Advisory published
2026-04-14
Advisory updated
2026-09-25

Who should care

Defenders and administrators of Windows Server and Windows 10/11 systems should assess exposure and apply patches. This vulnerability requires verification of affected versions and deployment of vendor patches.

Why it matters

CVE-2026-26174 is a high-severity vulnerability in Windows Server Update Service that allows local privilege escalation. Defenders and administrators of affected systems should verify exposure and apply patches.

  • Local privilege escalation requires immediate attention
  • Verify affected versions and apply patches
  • Monitor for unusual activity on Windows Server and Windows 10/11 systems

Technical summary

The vulnerability is a race condition in the Windows Server Update Service that allows an authorized attacker to elevate privileges locally. The CVSS score is 7 (High). Affected systems include multiple versions of Windows 10, Windows 11, and Windows Server releases. The vulnerability requires verification of affected versions and deployment of vendor patches. Defenders and administrators should assess exposure and apply patches immediately.

Defensive priority

Apply vendor patches immediately, especially for Windows Server and Windows 10/11 systems.

Recommended defensive actions

  • Apply patches from Microsoft for affected Windows versions
  • Review and update inventory of Windows Server and Windows 10/11 systems
  • Monitor systems for unusual activity

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, including its description, CVSS score, and affected systems. The vulnerability is a race condition in the Windows Server Update Service that allows an authorized attacker to elevate privileges locally. Multiple Windows versions and server releases are affected. Defenders and administrators should verify exposure and apply patches. The information provided is based on the CVE record and NVD detail page, which

Sources and references

Verified primary and authoritative sources

  • CVE-2026-26174 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-26174

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

  • CVE-2026-26174 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-26174

    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.