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CVE-2026-62695 Microsoft CVE debrief

A heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges locally. This vulnerability affects multiple versions of Windows 11 and Windows Server. Microsoft has released a patch for this vulnerability. The vulnerability has a high CVSS score of 7.8 and is considered HIGH severity. Defenders should prioritize patching for affected systems, especially those with high privilege escalation risk. The CVE Program and NVD provide official records of this vulnerability.

Vendor
Microsoft
Product
Windows 11 version 23H2
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-11
Original CVE updated
2026-10-08
Advisory published
2026-08-11
Advisory updated
2026-10-08

Who should care

Defenders and system administrators responsible for Windows 11 and Windows Server systems should assess exposure and apply patches. Prioritization should focus on systems with high privilege escalation risk. Inventory and prioritize patching for high-risk systems. Review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

CVE-2026-62695 is a high-severity elevation of privilege vulnerability in Windows Storage. Defenders should prioritize patching for affected systems, especially those with high privilege escalation risk.

  • Privilege escalation risk for authorized attackers
  • Potential for local elevation of privileges
  • Requires immediate patching for affected systems
  • Inventory and prioritize patching for high-risk systems

Technical summary

A heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges locally. This vulnerability affects Windows 11 versions 23H2, 24H2, 25H2, 26H1, and Windows Server 2022, 2025. The vulnerability has a high CVSS score of 7.8 and is considered HIGH severity. Microsoft has released a patch for this vulnerability. Defenders should prioritize patching for affected systems, especially those with high privilege escalation risk.

Defensive priority

Apply patches for CVE-2026-62695 immediately, especially for systems with high privilege escalation risk.

Recommended defensive actions

  • Apply patches for CVE-2026-62695
  • Inventory Windows 11 and Windows Server systems for exposure
  • Prioritize patching for systems with high privilege escalation risk

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft has released a vendor advisory with patch information. The vulnerability affects Windows 11 versions 23H2, 24H2, 25H2, 26H1, and Windows Server 2022, 2025. There is no indication of exploitation in the wild, but defenders should verify patch deployment for affected systems.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-62695 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-62695

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

  • CVE-2026-62695 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-62695

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

Supplemental references

  • Windows Storage Elevation of Privilege Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/62xxx/CVE-2026-62695.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62695

    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.