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CVE-2026-62694 Microsoft CVE debrief

A use-after-free vulnerability in Windows Installer allows an authorized attacker to elevate privileges locally. This CVE was published on 2026-09-08T18:17:52.170Z and was last modified on 2026-09-17T18:34:59.640Z. The NVD entry is currently Analyzed. The vulnerability is a use-after-free issue in Windows Installer that allows an authorized attacker to elevate privileges locally. The CVSS score for this vulnerability is 7, indicating a High severity level. The CVSS vector is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. Defenders should prioritize patching this vulnerability, especially for systems with high privilege escalation risk. The CVE record and NVD detail page provide more

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

Defenders responsible for Windows systems, especially those with high privilege escalation risk, should assess exposure and prioritize patching. This includes administrators of Windows 10, Windows 11, and Windows Server systems.

Why it matters

CVE-2026-62694 is a high-severity vulnerability in Windows Installer that allows local privilege escalation. Defenders should prioritize patching, especially for systems with high privilege escalation risk, and verify affected systems to ensure patch coverage.

  • Local privilege escalation is possible, allowing attackers to gain higher privileges on the system.
  • Successful exploitation requires an authorized attacker with local access.
  • Patching is necessary to prevent potential exploitation and privilege escalation.
  • Verification of affected systems and inventory is crucial to ensure patch coverage.

Technical summary

The vulnerability is a use-after-free issue in Windows Installer that allows an authorized attacker to elevate privileges locally. The CVSS score for this vulnerability is 7, indicating a High severity level. The CVSS vector is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

Defensive priority

Defenders should prioritize patching this vulnerability, especially for systems with high privilege escalation risk.

Recommended defensive actions

  • Apply patches from Microsoft for the affected Windows versions.
  • Review and update inventory to ensure all affected systems are patched.
  • Monitor systems for potential exploitation attempts.

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, including its CVSS score and vector. Microsoft has provided a patch and vendor advisory for this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-62694 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-62694

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

  • CVE-2026-62694 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-62694

    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.