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CVE-2026-69414 ShieldBreak Zero-Day: No Patch, and CISA BOD 26-04 Gives You 14 Days

medqualysPublished 2026-08-20

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<section style="background-color: #f7f8fb; padding: 16px 18px;"> <h4 style="color: #ed2e26;">Executive Summary</h4>

<p> <em>ShieldBreak (CVE-2026-69414) is a zero-day elevation-of-privilege vulnerability in the Microsoft Malware Protection Engine used by Microsoft Defender, allowing a low-privilege local attacker to escalate to SYSTEM. A public PoC was released on August 12, 2026,

MITRE ATT&CK techniques

Indicators of compromise

Original source: https://blog.qualys.com/category/product-tech/vulnmgmt-detection-response