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Critical Vulnerability in Windows Defender Firewall Exposes Sensitive Data

First seen 10 Dec 2025, 14:47 UTC • •

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ThreatCluster •March 12, 2026 at 13:27 UTC

Microsoft has disclosed a critical vulnerability in the Windows Defender Firewall Service that allows attackers with elevated privileges to access sensitive data. This flaw poses significant risks to users relying on the firewall for protection against cyber threats.

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