Windows 11 24h2
CVE-2026-21519
HIGH
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an authorized attacker to elevate privileges locally.
AnalysisAI
Desktop Window Manager (DWM) in Windows contains a type confusion vulnerability (CVE-2026-21519, CVSS 7.8) that enables authorized local attackers to escalate privileges. KEV-listed, this kernel-level vulnerability in the Windows compositor allows any authenticated user to achieve SYSTEM-level access through exploitation of an incompatible type access in DWM's resource handling.
Technical ContextAI
DWM is the Windows desktop compositor running as a SYSTEM-level service. The type confusion occurs when DWM accesses an internal resource using an incompatible type, causing the data to be misinterpreted. Because DWM runs with SYSTEM privileges and handles rendering for all desktop applications, exploiting this vulnerability grants complete system control. DWM vulnerabilities are valuable post-compromise tools.
RemediationAI
Apply Microsoft security update. Monitor for suspicious DWM interactions. Implement least-privilege access to limit impact of privilege escalation. Use endpoint detection for post-exploitation behaviors.
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External POC / Exploit Code
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