EUVD-2026-56405
GHSA-35mh-m2vc-vgv8
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low-privilege requirement confirmed by description; full C/I/A reflects achievable SYSTEM-level privilege escalation with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via heap-based buffer overflow in the Windows Desktop Window Manager (DWM) Core Library affects a broad range of Windows client and server editions spanning from Windows 10 1607 through Windows 11 26H1 and multiple Windows Server releases. An authenticated local attacker can exploit the overflow to gain full system-level privileges, achieving high confidentiality, integrity, and availability impact on the compromised host. …
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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 Windows system - the CVSS vector PR:L confirms low-privilege authenticated access is sufficient, and the AV:L vector confirms the attack must be executed locally (not remotely over the network). … 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 characterizes this as a high-severity local privilege escalation requiring no special configuration and no user interaction beyond holding a low-privilege account. … 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 remediation is to apply the vendor-released patch via Windows Update or WSUS targeting the fixed build numbers per affected version: Windows 10 1607/Server 2016 to build 10.0.14393.9418 or later, Windows 10 1809/Server 2019 to build 10.0.17763.9115 or later, Windows 10 21H2 to build 10.0.19044.7663 or later, Windows 10 22H2 to build 10.0.19045.7663 or later, Windows 11 23H2 to build 10.0.22631.7517 or later, Windows 11 24H2/Server 2025 to build 10.0.26100.9168 or later (note: Server 2025 requires 10.0.26100.33296), Windows 11 25H2 to build 10.0.26200.9168 or later, Windows 11 26H1 to build 10.0.28000.2704 or later, and Windows Server 2022 to build 10.0.20348.5499 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all affected Windows systems running Windows 10 1607 or later and Windows 11 up to 26H1, prioritizing servers, domain controllers, and systems with elevated data sensitivity. …
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External POC / Exploit Code
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