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Recently, the U.S. federal cybersecurity agency raised an alert concerning a critical security flaw in Microsoft Defender, the pre-installed security software for Windows systems. This vulnerability, designated as CVE-2026-33825 and dubbed 'BlueHammer,' enables authenticated attackers to elevate their privileges on compromised systems. In scenarios where an attacker has already breached a corporate or institutional network, these elevated privileges could significantly facilitate the progression of their malicious activities. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has confirmed that this vulnerability has been leveraged in ransomware attacks, although it has refrained from disclosing details about the specific attack groups implicated.
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