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Recent Microsoft Defender Vulnerability Exploited as Zero-Day

📅 23 April 2026 at 08:00 UTC📰 Security WeekView original source ↗

The flaw allows attackers to access the SAM database, extract NTLM hashes, and gain System privileges. The post Recent Microsoft Defender Vulnerability Exploited as Zero-Day appeared first on SecurityWeek.

🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview

A zero-day vulnerability in Microsoft Defender allows attackers to access the System Access Control List (SAM) database, extract NTLM hashes, and gain system privileges, posing a significant risk to affected systems.

⚙️Technical Details
Affected Systems
Microsoft Defender
Attack Vectors
Exploitation of a zero-day vulnerability
💥Impact Assessment
Severity: critical
Who Is at Risk
Organizations using Microsoft Defender with the vulnerable version
🛡️Recommended Actions
1Apply the latest security patches to affected systems immediately
2Monitor system logs for suspicious activity and investigate any NTLM hash extractions
3Implement additional security controls, such as multi-factor authentication, to prevent lateral movement
📦Affected Products
Microsoft Defender

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