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CVE-2026-96308 Microsoft CVE debrief

A Windows Installer elevation of privilege vulnerability exists due to a use-after-free condition. An authorized attacker could exploit this vulnerability locally to elevate privileges. This vulnerability affects Windows 10, Windows 11, and Windows Server versions. System administrators and security teams should prioritize patching affected versions to prevent local privilege escalation. The vulnerability has a high severity with a CVSS score of 7.8. Defenders should focus on verifying patch application and monitoring for unusual activity that could indicate exploitation attempts.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

System administrators and security teams responsible for Windows 10, Windows 11, and Windows Server versions listed in the affected products should prioritize patching.

Why it matters

CVE-2026-96308 is a high-severity elevation of privilege vulnerability in Windows Installer. Defenders should prioritize patching affected Windows versions to prevent local privilege escalation. Monitoring for exploitation attempts and verifying patch application are crucial.

  • Verify patch application to prevent local privilege escalation.
  • Monitor for unusual activity that could indicate exploitation attempts.
  • Assess exposure of affected Windows versions in your environment.
  • Prioritize patching for high-risk systems.

Technical summary

The vulnerability exists in the Windows Installer due to a use-after-free condition. An authorized attacker could exploit this vulnerability locally to elevate privileges. This vulnerability affects Windows 10, Windows 11, and Windows Server versions. The vulnerability has a high severity with a CVSS score of 7.8. Microsoft has released a patch for this vulnerability, and defenders should prioritize patching affected versions.

Defensive priority

Apply patches immediately for Windows 10, Windows 11, and Windows Server versions listed in the affected products.

Recommended defensive actions

  • Inventory affected Windows 10, Windows 11, and Windows Server versions.
  • Apply patches from Microsoft for affected versions.
  • Monitor systems for unusual privilege escalation activity.
  • Verify patch application and system integrity.

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft has released a patch for this vulnerability. The vulnerability is a use-after-free condition in Windows Installer, allowing an authorized attacker to elevate privileges locally. The official CVE record was published on 2026-10-13T19:00:32.950Z. The CVE Program record and NVD vulnerability detail provide source-provided CVE metadata and official NIST NVD detail page and source-specific vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-96308 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-96308

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

  • CVE-2026-96308 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-96308

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Windows Installer Elevation of Privilege Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/96xxx/CVE-2026-96308.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96308

    Supplemental source - vendor-advisory, patch

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.