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CVE-2026-83885 Microsoft CVE debrief

A Windows Virtualization-Based Security (VBS) Enclave Spoofing Vulnerability exists in multiple Windows 11 and Windows Server versions. An authorized local attacker could exploit this vulnerability to perform spoofing. The CVSS score is 5.6, indicating a medium severity. This vulnerability is caused by inadequate encryption strength in VBS Enclave. Defenders managing Windows 11 and Windows Server environments, especially those using VBS Enclave, should assess exposure and prioritize patching. The CVE Program and NVD provide official records of this vulnerability. Microsoft has a vendor advisory for this issue. Affected versions and configurations are detailed in the source corpus.

Vendor
Microsoft
Product
Windows 11 Version 24H2
CVSS
MEDIUM 5.6
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

Defenders managing Windows 11 and Windows Server environments, especially those using VBS Enclave, should assess exposure and prioritize patching.

Why it matters

CVE-2026-83885 is a medium-severity vulnerability in Windows Virtualization-Based Security (VBS) Enclave that allows local spoofing. Defenders should verify exposure, especially in Windows 11 and Windows Server environments using VBS Enclave, and prioritize patching.

  • Verify VBS Enclave usage and configurations.
  • Assess local access controls and authorization mechanisms.
  • Monitor for suspicious local access attempts.
  • Apply patches as available to prevent spoofing.

Technical summary

The Windows Virtualization-Based Security (VBS) Enclave Spoofing Vulnerability (CVE-2026-83885) is due to inadequate encryption strength in VBS Enclave, allowing an authorized local attacker to perform spoofing. This vulnerability affects multiple versions of Windows 11 and Windows Server.

Defensive priority

Defenders should prioritize verifying exposure in Windows 11 and Windows Server environments, especially where VBS Enclave is used, and apply patches as available.

Recommended defensive actions

  • Verify and apply Microsoft patches for affected Windows 11 and Windows Server versions.
  • Inventory Windows 11 and Windows Server systems for VBS Enclave usage.
  • Monitor for local authorized access attempts.

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft has a vendor advisory for this issue. Affected versions and configurations are detailed in the source corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-83885 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-83885

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

  • CVE-2026-83885 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-83885

    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.