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CVE-2026-33104 Microsoft CVE debrief

A Win32k Elevation of Privilege Vulnerability exists in various Windows versions. An authorized attacker can exploit this vulnerability locally to elevate privileges. This vulnerability, tracked as CVE-2026-33104, is a race condition issue in Windows Win32K - GRFX. It allows an attacker with local access to potentially elevate their privileges. The vulnerability affects multiple Windows versions, including Windows 10, Windows 11, and Windows Server versions. The issue arises from improper synchronization in the Win32K - GRFX component, leading to a race condition that can be exploited for privilege escalation.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7
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, system administrators, and IT teams responsible for Windows systems should assess exposure and apply patches immediately to prevent potential privilege escalation attacks.

Why it matters

CVE-2026-33104 is a high-severity elevation of privilege vulnerability in Win32k. Defenders should prioritize patching affected Windows versions to prevent potential attacks.

  • Potential local privilege escalation
  • Increased risk for authorized attackers
  • Need for immediate patching and verification

Technical summary

The Win32k Elevation of Privilege Vulnerability (CVE-2026-33104) is a race condition issue in Windows Win32K - GRFX that allows an authorized attacker to elevate privileges locally. Affected versions include Windows 10, Windows 11, and Windows Server versions.

Defensive priority

Apply patches immediately for affected Windows versions, assess exposure, and verify system integrity.

Recommended defensive actions

  • Apply patches for affected Windows 10, Windows 11, and Windows Server versions
  • Assess exposure and prioritize patching for high-risk systems
  • Verify system integrity and monitor for potential exploitation attempts

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft offers a patch for affected versions. The vulnerability is a race condition issue in Windows Win32K - GRFX that allows an authorized attacker to elevate privileges locally. Evidence from the CVE Program and NVD confirms the vulnerability's existence and provides details on affected versions. Microsoft's patch addresses the improper synchronization issue in Win32K - GRFX, preventing potential privilege эска

Sources and references

Verified primary and authoritative sources

  • CVE-2026-33104 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-33104

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

  • CVE-2026-33104 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-33104

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

Supplemental references

  • Win32k Elevation of Privilege Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33104.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33104

    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.