CISA says ransomware gangs are exploiting Microsoft Defender’s BlueHammer flaw, patched in April 2026 after zero-day reports.

BlueHammer became public on April 2 in an unusual fashion. A researcher using the names Chaotic Eclipse and Nightmare Eclipse ...

CISA confirmed on Monday that ransomware gangs are now exploiting a Microsoft Defender privilege escalation vulnerability, dubbed BlueHammer, that has previously been abused in zero-day attacks.

A Microsoft Defender vulnerability tracked as BlueHammer and CVE-2026-33825 is being exploited in ransomware attacks ...

Windows users should think about reinforcing their antivirus software. And while Microsoft Defender should provide a line of defense against ransomware, a new report claims that hackers have found a ...