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CVE-2026-73005 Microsoft CVE debrief

CVE-2026-73005 is a high-severity vulnerability in Windows Authentication Methods that allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7 and is classified as HIGH. Microsoft has released a patch for this vulnerability. Affected versions include Windows 10, Windows 11, and Windows Server. Windows system administrators and security teams should assess exposure and apply patches immediately to prevent local privilege escalation. The vulnerability is a use-after-free issue in Windows Authentication Methods.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-17
Advisory published
2026-09-08
Advisory updated
2026-09-17

Who should care

Windows system administrators and security teams should assess exposure and apply patches immediately to prevent local privilege escalation. Inventory and patch management are critical for Windows systems. Verify patch deployment to prevent exploitation. This vulnerability affects Windows 10, Windows 11, and Windows Server deployments.

Why it matters

CVE-2026-73005 is a high-severity vulnerability in Windows Authentication Methods that allows an authorized attacker to elevate privileges locally. Windows system administrators and security teams should assess exposure and apply patches immediately to prevent local privilege escalation.

  • Local privilege escalation requires immediate patching
  • Inventory and patch management are critical for Windows systems
  • Verify patch deployment to prevent exploitation

Technical summary

The vulnerability is a use-after-free issue in Windows Authentication Methods, which allows an authorized attacker to elevate privileges locally. The CVSS vector is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. Affected versions include Windows 10, Windows 11, and Windows Server. Microsoft has provided a patch for this vulnerability. The vulnerability requires immediate patching to prevent exploitation.

Defensive priority

Apply patches immediately to prevent local privilege escalation

Recommended defensive actions

  • Apply patches immediately to prevent local privilege escalation
  • Inventory Windows systems for exposure
  • Verify patch deployment

Evidence notes

The vulnerability is described as a use-after-free issue in Windows Authentication Methods. Affected versions include Windows 10, Windows 11, and Windows Server. Microsoft has provided a patch for this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-73005 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-73005

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

  • CVE-2026-73005 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-73005

    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.