A Microsoft Defender flaw is now being linked to ransomware attacks
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Why it matters: Microsoft Defender, the security software built into Windows, is under pressure from a flaw that has now been linked to ransomware, according to federal cybersecurity officials. The vulnerability, listed as CVE-2026-33825 and known as BlueHammer, lets an authenticated attacker raise their privileges on a system. Once already inside a network, that extra level of access can be enough to move the attack forward. The Cybersecurity and Infrastructure Security Agency says the flaw has been used in ransomware campaigns, but it does not name the groups involved.
BlueHammer became publicon April 2 in an unusual fashion. A researcher using the names Chaotic Eclipse and Nightmare Eclipse released exploit details before Microsoft had a patch ready, saying they were unhappy with how the company handles vulnerability reports. That early release reduced...
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