CVE-2026-21519

HIGH
2026-02-10 [email protected]
7.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 22:02 vuln.today
Added to CISA KEV
Feb 11, 2026 - 16:13 cisa
CISA KEV
CVE Published
Feb 10, 2026 - 18:16 nvd
HIGH 7.8

Tags

Buffer Overflow Windows 11 24h2 Windows 11 23h2 Windows 10 21h2 Windows Server 2022 23h2 Windows 11 25h2 Windows Server 2022 Windows Server 2016 Windows 10 22h2 Windows 10 1607 Windows Server 2019 Windows 10 1809 Windows Server 2025 Microsoft

Description

Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an authorized attacker to elevate privileges locally.

Analysis

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.

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Remediation

Within 24 hours: Inventory all Windows systems running affected DWM versions and assess exposure in high-value environments (domain controllers, servers, sensitive workstations). Within 7 days: Implement compensating controls including strict user access policies, disable unnecessary local login capabilities, and enforce application whitelisting where feasible. …

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Priority Score

92
Low Medium High Critical
KEV: +50
EPSS: +3.1
CVSS: +39
POC: 0

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CVE-2026-21519 vulnerability details – vuln.today
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