VulnerabilityBleeping Computer
7.8 — HIGH
CISA: Windows BlueHammer flaw now exploited by ransomware gangs
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. [...]
🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview
Ransomware gangs have begun exploiting a high-severity Microsoft Defender privilege escalation vulnerability, dubbed BlueHammer (CVE-2026-33825), allowing them to elevate privileges locally and potentially take control of targeted systems.
⚙️Technical Details
💥Impact Assessment
Severity: High
Who Is at Risk
Federal Civilian Executive Branch (FCEB) agencies and potentially other organizations using Microsoft Defender Antimalware Platform
🛡️Recommended Actions
1Apply the April 2026 Patch Tuesday patch to update Microsoft Defender with the BlueHammer vulnerability fixed
2Monitor for suspicious activity and implement additional security controls to prevent lateral movement
3Conduct regular vulnerability assessments and penetration testing to identify potential weaknesses
📦Affected Products
Microsoft Defender Antimalware Platform
🔐NVD Verified DataVERIFIED
CVE-2026-33825 ↗CVSS 7.8 — HIGH
Attack Vector
LOCAL
Complexity
LOW
Vector String
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeaknesses
CWE-1220
Affected Products (CPE)
Microsoft Defender Antimalware Platform
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