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Critical Zero-Day Vulnerability in Windows Desktop Window Manager Exploited

Critical Zero-Day Vulnerability in Windows Desktop Window Manager Exploited

First seen 11 Feb 2026, 19:30 UTC

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ThreatCluster AI
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 183d 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

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