EUVD-2026-56399
GHSA-4rqg-xw8g-5x6w
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with low privileges required to invoke Win32K syscall; no user interaction needed; full CIA impact upon SYSTEM escalation, scope unchanged.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Stack-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via stack-based buffer overflow in the Windows Win32K kernel-mode subsystem enables a locally authenticated low-privileged user to gain SYSTEM-level access. Nineteen distinct Windows releases are confirmed affected, spanning Windows 10 through Windows 11 26H1 and Windows Server 2012 through Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must have an interactive or programmatic local session on the target Windows system with at minimum a standard (low-privilege) user account, consistent with CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects the severity: local privilege escalation to full SYSTEM integrity with no user interaction and low attack complexity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released patches immediately via Windows Update or WSUS. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, confirm availability of the vendor-released patch and identify all Windows 10, Windows 11, and Windows Server 2012-2025 systems across your organization. …
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External POC / Exploit Code
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