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CVE-2026-83927 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-10-13T18:59:59.099Z and has not been modified since then. The NVD entry is currently 7.8 HIGH. This Windows Registry Elevation of Privilege Vulnerability allows an authorized attacker to elevate privileges locally due to improper link resolution before file access. Affected versions include Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 versions 23H2, 24H2, 25H2, 26H1, 26H2, and Windows Server 2022, 2025. Defenders should verify exposure, apply patches, and monitor systems for potential attacks. The CVE Program record and NVD vulnerability detail provide additional

Vendor
Microsoft
Product
Windows 10 Version 21H2
CVSS
HIGH 7.8
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 responsible for Windows systems, particularly those managing Windows 10, Windows 11, and Windows Server environments, should assess exposure and apply patches.

Why it matters

CVE-2026-83927 is a high-severity vulnerability in Windows Registry that allows local privilege elevation. Defenders should verify exposure, apply patches, and monitor systems for potential attacks. Affected versions require immediate attention.

  • Verify and apply patches to prevent local privilege elevation
  • Monitor Windows systems for unusual privilege escalation attempts
  • Assess and update inventory of affected Windows versions

Technical summary

The Windows Registry Elevation of Privilege Vulnerability allows an authorized attacker to elevate privileges locally due to improper link resolution before file access. Affected versions include Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 versions 23H2, 24H2, 25H2, 26H1, 26H2, and Windows Server 2022, 2025.

Defensive priority

Defenders should prioritize verifying exposure and applying patches for Windows Registry Elevation of Privilege Vulnerability.

Recommended defensive actions

  • Verify exposure to Windows Registry Elevation of Privilege Vulnerability
  • Apply patches from Microsoft for affected Windows versions
  • Monitor Windows systems for potential privilege elevation attempts

Evidence notes

The CVE Program record and NVD vulnerability detail provide information on the Windows Registry Elevation of Privilege Vulnerability. Microsoft's advisory is referenced as a source.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-83927 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-83927

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

  • CVE-2026-83927 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-83927

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

Supplemental references

  • Windows Registry Elevation of Privilege Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/83xxx/CVE-2026-83927.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83927

    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.