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CVE-2026-32220 Microsoft CVE debrief

A security feature bypass vulnerability exists in Windows Virtualization-Based Security (VBS) Enclave, which could allow an authorized attacker to bypass UEFI Secure Boot locally. This issue affects multiple versions of Windows 11 and Windows Server 2025. The vulnerability in Windows Virtualization-Based Security (VBS) Enclave could allow an authorized attacker to bypass UEFI Secure Boot locally, potentially impacting Windows 11 and Windows Server 2025 environments. Defenders should prioritize verification of exposure and assess the need for patches or mitigations. Understanding VBS Enclave configurations and their impact on UEFI Secure Boot is crucial for prioritizing remediation.

Vendor
Microsoft
Product
Windows 11 Version 24H2
CVSS
MEDIUM 4.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-14
Original CVE updated
2026-10-15
Advisory published
2026-04-14
Advisory updated
2026-10-15

Who should care

Defenders responsible for Windows 11 and Windows Server 2025 environments, especially those utilizing VBS Enclave, should assess exposure and prioritize verification and potential remediation.

Why it matters

The CVE-2026-32220 vulnerability in Windows Virtualization-Based Security (VBS) Enclave could allow an authorized attacker to bypass UEFI Secure Boot locally, potentially impacting Windows 11 and Windows Server 2025 environments. Defenders should prioritize verification of exposure and assess the need for patches or mitigations.

  • Verification of exposure in Windows 11 and Windows Server 2025 environments is necessary to determine potential vulnerability.
  • Defenders should assess the need for patches or mitigations to prevent potential security feature bypass.
  • Understanding VBS Enclave configurations and their impact on UEFI Secure Boot is crucial for prioritizing remediation efforts.

Technical summary

The vulnerability exists in Windows Virtualization-Based Security (VBS) Enclave, allowing an authorized attacker to bypass UEFI Secure Boot locally. Affected products include Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows Server 2025, and Windows Server 2025 (Server Core installation).

Defensive priority

Defenders should prioritize verifying exposure in Windows 11 and Windows Server 2025 environments, especially where VBS Enclave is utilized, and assess the need for patches or mitigations.

Recommended defensive actions

  • Verify exposure in Windows 11 and Windows Server 2025 environments
  • Assess the need for patches or mitigations
  • Review VBS Enclave configurations for potential vulnerabilities

Evidence notes

The CVE record and source item provide details on the vulnerability, but specific exploitation or impact data is not available. Affected versions and configurations are listed, but verification of exposure is necessary.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-32220 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-32220

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

  • CVE-2026-32220 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-32220

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

Supplemental references

  • UEFI Secure Boot Security Feature Bypass Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/32xxx/CVE-2026-32220.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32220

    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.