EUVD-2026-35762
GHSA-4hhf-v394-cmfq
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Desktop Window Manager (DWM) Core Library allows an authenticated low-privileged user to elevate to higher privileges by exploiting a use-after-free memory corruption flaw (CWE-416). The issue was reported by Microsoft's security team (secure@microsoft.com) and tracked via MSRC, with no public exploit identified at time of analysis. Successful exploitation yields full confidentiality, integrity, and availability impact on the local host.
Technical ContextAI
The Desktop Window Manager (DWM) is the compositing window manager responsible for hardware-accelerated rendering of the Windows desktop, window thumbnails, transparency, and visual effects; its Core Library (dwmcore.dll) runs in a privileged context and interacts with kernel graphics subsystems. The flaw is classified as CWE-416 (Use After Free), meaning DWM Core retains and dereferences a pointer to an object whose backing memory has already been released, enabling controlled memory reuse. Because DWM components handle messages and shared graphics objects across security boundaries, a freed-then-reused object can be steered to overwrite function pointers or virtual-table entries to redirect execution into attacker-controlled code paths at elevated privilege. The tag set also references Denial of Service and Memory Corruption, consistent with the typical UAF outcome spectrum (crash vs. controlled hijack).
RemediationAI
Patch available per vendor advisory - apply the Microsoft security update referenced on the MSRC update guide for CVE-2026-44804 (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44804) via Windows Update, WSUS, or your preferred patch management channel as soon as your maintenance window permits; the exact fix KB and build numbers should be taken directly from that MSRC page. Because the attack vector is local and requires an authenticated user, compensating controls until patching is complete include restricting interactive logon rights and removing standard users from systems that do not require them, enforcing application allow-listing (WDAC or AppLocker) to prevent execution of untrusted binaries that would deliver the exploit, and tightening EDR detections for anomalous child processes spawned from dwm.exe or unusual handle-table activity against DWM objects - noting that disabling DWM itself is not a viable workaround on modern Windows because the desktop compositor is required for the shell.
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Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today