EUVD-2026-56398
GHSA-hhj6-82rw-3j95
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local kernel LPE exploitable by any standard user with no complexity or interaction; SYSTEM-level access upon success yields full CIA impact bounded to the local host.
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
Out-of-bounds read in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via out-of-bounds read in the Windows Win32K kernel graphics subsystem affects every supported and extended-support Windows client and server release, from Windows Server 2012 through Windows 11 26H1. Any locally authenticated standard user - requiring no elevated permissions or user interaction - can exploit CWE-125 in win32k.sys to obtain SYSTEM-level privileges. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid local user account on the target system with the ability to execute code locally - no administrator or special group membership is needed, only standard authenticated user access (PR:L per the CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score with AV:L/AC:L/PR:L/UI:N/S:U accurately captures a straightforward local privilege escalation: any authenticated user with the ability to execute code locally can exploit this at low complexity with no interaction required, and with unchanged scope the impact is bounded to the compromised host. … 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 Microsoft security update for the applicable Windows build, available through Windows Update, Windows Server Update Services (WSUS), or the Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and document all Windows systems running Server 2012-2022 and Windows 8.1-11 versions in your infrastructure. …
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Information Disclosure
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External POC / Exploit Code
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