EUVD-2026-56687
GHSA-hmq4-m8wx-rw8c
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low privilege required align with a standard user triggering DWM UAF; full C/I/A reflects SYSTEM-level code execution potential within the local scope.
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
Privilege escalation in Windows Desktop Window Manager (DWM) Core Library via a use-after-free memory corruption flaw allows a locally authenticated, low-privileged attacker to achieve full SYSTEM-level code execution. Affected systems span Windows 10 21H2/22H2, Windows 11 23H2 through 26H1, Windows Server 2022, and Windows Server 2025 (including Server Core), representing a broad cross-section of the active Microsoft OS estate. No public exploit or CISA KEV listing has been identified at time of analysis, but the low attack complexity and wide version coverage make patching a near-term priority.
Technical ContextAI
The Desktop Window Manager (DWM) is the Windows compositing engine responsible for rendering the visual desktop, managing window surfaces, and applying graphical effects. It runs as a privileged system service (dwm.exe), making it a high-value target for local privilege escalation. CWE-416 (Use After Free) describes a memory safety defect where a program retains and dereferences a pointer to a heap object after that object has been freed; an attacker who can control the contents of the reclaimed memory region can redirect execution flow, typically via heap spray or controlled allocation. In DWM's context, this likely involves manipulating window or graphical resource lifecycle events to leave a dangling pointer that is subsequently dereferenced in a privileged code path. Affected builds span CPEs covering Windows 10 (builds <10.0.19044.7663 and <10.0.19045.7663), Windows 11 (builds <10.0.22631.7517, <10.0.26100.9168, <10.0.26200.9168, <10.0.28000.2704), Windows Server 2022 (<10.0.20348.5499), and Windows Server 2025 (<10.0.26100.33296), as recorded in ENISA EUVD-2026-56687.
RemediationAI
Apply the Microsoft-released security update for CVE-2026-62888 via Windows Update, WSUS, or the Microsoft Update Catalog. Confirmed patched build thresholds per EUVD data are: Windows 10 21H2 to 10.0.19044.7663 or later, Windows 10 22H2 to 10.0.19045.7663 or later, Windows 11 23H2 to 10.0.22631.7517 or later, Windows 11 24H2 and Windows Server 2025 to 10.0.26100.9168 (desktop) or 10.0.26100.33296 (Server 2025) or later, Windows 11 25H2 to 10.0.26200.9168 or later, Windows 11 26H1 to 10.0.28000.2704 or later, and Windows Server 2022 to 10.0.20348.5499 or later. The full Microsoft advisory is at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62888. Where immediate patching is not feasible, restrict interactive and Remote Desktop logon rights to only accounts that operationally require them - this narrows the pool of accounts that could execute the exploit locally, though it does not eliminate risk for accounts that legitimately retain local access. No Microsoft-documented workaround specific to this vulnerability was present in the provided data.
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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
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