EUVD-2026-56684
GHSA-vmq2-279f-4hcf
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local kernel-mode driver exploitation requiring only a standard user session; no network vector, no interaction, full C/I/A impact upon SYSTEM escalation.
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
Heap-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via heap-based buffer overflow in Windows Win32K (win32k.sys) allows a low-privileged local user to achieve full SYSTEM-level control across a broad range of Windows and Windows Server releases. The vulnerability spans Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through Server 2025, making the attack surface effectively ubiquitous across enterprise environments. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local session with at minimum standard (low-privileged) user rights, confirmed by CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H yields a score of 7.8, correctly reflecting a reliable local privilege escalation: low-complexity exploitation, no user interaction, and full C/I/A impact. … 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 | The primary fix is to apply Microsoft's released security update, which patches Win32K across all affected release lines. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct inventory of all Windows 10, 11, and Windows Server 2012-2025 systems across your organization using your endpoint management platform to establish baseline scope. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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