EUVD-2026-44302
GHSA-jc8m-7r22-73r7
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local EoP requiring prior low-privileged code execution gives AV:L/PR:L; type confusion yielding SYSTEM justifies C:H/I:H/A:H with unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Access of resource using incompatible type ('type confusion') in Windows DWM allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Desktop Window Manager (DWM) Core Library allows an authenticated attacker to gain SYSTEM-level privileges by triggering a type-confusion (CWE-843) condition. The flaw affects a broad range of supported Windows client and server releases from Windows 10 1607 through Windows 11 26H1 and Windows Server 2016 through 2025. Reported internally by Microsoft with a vendor patch available; no public exploit identified at time of analysis.
Technical ContextAI
The Desktop Window Manager (DWM) is the compositing window manager that has been a core component of Windows since Vista, running as a privileged service (dwm.exe / associated kernel-mode and user-mode libraries such as dwmcore.dll) to render the composited desktop, window animations, and visual effects. This vulnerability is a CWE-843 'Access of Resource Using Incompatible Type' (type confusion) issue, in which code accesses an object assuming one type while it is actually another, leading to out-of-bounds reads/writes or corrupted pointer dereferences - categorized in the vendor tags as memory corruption. Because DWM processes objects on behalf of every interactive session with elevated privileges, a type-confusion bug in its handling of window/composition objects can be leveraged by a low-privileged process to corrupt memory in a higher-privileged context.
RemediationAI
Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-58541 for each affected SKU as listed in the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58541; the exact per-version fixed build numbers should be taken directly from that advisory rather than assumed. Because the vulnerability lives in the core DWM composition component that runs continuously in every interactive session, there is no supported feature toggle or configuration workaround to disable it, so patching is the only reliable remediation. Until the update is deployed, reduce exposure by limiting who can obtain local/interactive code execution on affected hosts - enforce least privilege, restrict local logon rights, and prioritize multi-user and RDS/session-host systems where untrusted low-privileged users share a machine, since those environments most directly expose a local EoP primitive.
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External POC / Exploit Code
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