EUVD-2026-56658
GHSA-jfxr-w3vr-mw6h
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only attack vector and low-privilege requirement are consistent with a Shell-level LPE; full C/I/A impact reflects SYSTEM-level code execution with no scope change to adjacent systems.
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 Shell allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via heap-based buffer overflow in Windows Shell affects a broad range of Microsoft Windows desktop and server releases, from Windows 10 Version 1607 through Windows 11 26H1 and Windows Server 2012 through Server 2025. A locally authenticated, low-privileged attacker can trigger heap corruption within the Windows Shell component to achieve full SYSTEM-level code execution with no user interaction required and low attack complexity. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local, authenticated session with at minimum a standard low-privileged user account on the target Windows system, as confirmed by the CVSS vector metrics AV:L and PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.8 with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H accurately reflects a reliable, low-complexity local privilege escalation yielding full confidentiality, integrity, and availability 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 | Apply the Microsoft-released security updates for each affected Windows version to reach the patched build numbers confirmed by EUVD-2026-56658: Windows 11 24H2 to build 10.0.26100.9168 or later, Windows 11 23H2 to 10.0.22631.7517 or later, Windows 11 26H1 to 10.0.28000.2704 or later, Windows Server 2025 to 10.0.26100.33296 or later, Windows Server 2022 to 10.0.20348.5499 or later, Windows Server 2019 to 10.0.17763.9115 or later, Windows Server 2016 to 10.0.14393.9418 or later, Windows Server 2012 R2 to 6.3.9600.23337 or later, and Windows Server 2012 to 6.2.9200.26279 or later; updates are distributed via Windows Update, WSUS, and the Microsoft Update Catalog per https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62770. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all Windows systems running versions 1607 and later (Windows 10), Windows 11 (through version 26H1), and Windows Server 2012-2025 to identify affected devices and prioritize critical systems. …
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External POC / Exploit Code
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