Critical Zero-Day Vulnerability in Windows Desktop Window Manager Exploited

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Critical Zero-Day Vulnerability in Windows Desktop Window Manager Exploited

First seen 11 Feb 2026, 19:30 UTC • •40.5

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ThreatCluster •March 12, 2026 at 16:10 UTC

Microsoft has issued urgent security updates for a critical zero-day vulnerability in the Windows Desktop Window Manager (DWM), tracked as CVE-2026-21519. This flaw is actively being exploited, enabling attackers to gain full control over affected systems. Users of Windows operating systems are urged to apply the updates immediately to mitigate risks.

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Updated 229d ago How this analysis works

Timeline

2026-02-10

CVE-2026-21519 published

2026-02-10

CVE-2026-21519 added to CISA KEV (active exploitation)

2026-02-11

Microsoft releases security updates for DWM

More articles in this cluster (2)

Threat Graph

4 entities, 3 inferred relationships (STIX 2.1).

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Technique (2)

Zero-day Exploit
T1068 - Exploitation for Privilege Escalation

Vulnerability (1)

CVE-2026-21519

Affected Platform (1)

Windows

Relationships

CVE-2026-21519 targets Windows
Zero-day Exploit targets Windows
T1068 - Exploitation for Privilege Escalation targets Windows

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