VulnerabilityBleeping Computer
7.8 — HIGH
Microsoft working on Defender patch for ShieldBreak zero-day
Microsoft is working on a security patch for the "ShieldBreak" zero-day vulnerability disclosed last week by security researcher "Nightmare Eclipse" and now tracked as CVE-2026-69414. [...]
🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview
Microsoft has confirmed a ShieldBreak zero-day vulnerability in its Defender security engine, which allows local attackers with limited permissions to gain SYSTEM privileges on fully patched Windows systems. The vulnerability was disclosed by Nightmare Eclipse without prior notice to Microsoft.
⚙️Technical Details
CVEs
CVE-2026-50656CVE-2026-69414
Affected Systems
Windows 10Windows 11Windows Server
Attack Vectors
LOCAL
💥Impact Assessment
Severity: High
Who Is at Risk
Users of Windows 10, Windows 11, and Windows Server systems with Microsoft Defender enabled
🛡️Recommended Actions
1Enable Microsoft Defender and keep it up-to-date
2Use a reputable antivirus solution in addition to Microsoft Defender
3Implement additional security measures such as firewall rules and access controls
📦Affected Products
Microsoft Malware Protection Engine
🔐NVD Verified DataVERIFIED
CVE-2026-50656 ↗CVSS 7 — HIGH
Attack Vector
LOCAL
Complexity
HIGH
Vector String
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HWeaknesses
CWE-59
Affected Products (CPE)
Microsoft Malware Protection Engine
CVE-2026-69414 ↗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:HRead the full article
This is a curated summary. The complete article is available at Bleeping Computer.