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CVE-2026-102189 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, including 23H2, 24H2, 25H2, 26H1, and 26H2, as well as Windows Server 2022, 2025, and 2025 (Server Core installation). Microsoft has released a patch for this vulnerability. The vulnerability can lead to system compromise if exploited, emphasizing the need for immediate patching and inventory checks for exposed systems.

Vendor
Microsoft
Product
Windows 11 version 23H2
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-14
Advisory published
2026-10-13
Advisory updated
2026-10-14

Who should care

Defenders responsible for Windows 11 and Windows Server systems should assess exposure and apply patches. This vulnerability allows for local privilege escalation, which can be critical in certain deployment contexts.

Why it matters

CVE-2026-102189 allows authorized attackers to elevate privileges locally on Windows Storage systems, requiring immediate patching and inventory checks for exposed systems.

  • Local privilege escalation can lead to system compromise
  • Authorized attackers can exploit this vulnerability
  • Patching is required to prevent exploitation

Technical summary

A heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges locally. This vulnerability affects multiple versions of Windows 11, including 23H2, 24H2, 25H2, 26H1, and 26H2, as well as Windows Server 2022, 2025, and 2025 (Server Core installation).

Defensive priority

Apply patches for CVE-2026-102189 immediately, as it allows for local privilege escalation.

Recommended defensive actions

  • Apply patches for CVE-2026-102189
  • Inventory Windows 11 and Windows Server systems for exposure
  • Verify local privilege escalation risk

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft has released a vendor advisory with patches for this issue. The vulnerability has been publicly disclosed and requires immediate attention from defenders responsible for Windows 11 and Windows Server systems. Evidence is based on official CVE and NVD records, as well as the Microsoft vendor advisory.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-102189 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-102189

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

  • CVE-2026-102189 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-102189

    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/2026/102xxx/CVE-2026-102189.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102189

    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.