BlueHammer
CISA: Windows BlueHammer flaw now exploited by ransomware gangs
CISA confirmed on Monday that ransomware gangs have begun exploiting a high-severity Microsoft Defender privilege escalation vulnerability that has previously been abused in zero-day attacks. Dubbed BlueHammer, the security flaw (CVE-2026-33825) was leaked by a security researcher known as “Nightmare Eclipse” in early April, together with proof-of-concept exploit code, in protest at how the Microsoft Security Response […]
CISA orders feds to patch BlueHammer flaw exploited as zero-day
CISA has given U.S. government agencies two weeks to secure their Windows systems against a Microsoft Defender privilege escalation vulnerability that has been exploited in zero-day attacks. Tracked as CVE-2026-33825, this high-severity security flaw allows low-privileged local threat actors to gain SYSTEM permissions on unpatched devices by exploiting an insufficient granularity of access control weakness. Microsoft patched […]