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NTLM Authentication Vulnerabilities Exploited in Cyber Attacks on Windows Systems

First seen 26 Nov 2025, 17:31 UTC • •

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ThreatCluster •March 12, 2026 at 13:27 UTC

Hackers are actively exploiting vulnerabilities in NTLM authentication to target Windows systems. This issue, which has been known since 2001, has escalated into a significant security crisis affecting numerous organizations. Attackers are weaponizing these flaws to gain unauthorized access to sensitive information.

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