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Microsoft Security Response CenterCVE-2026-55012

Microsoft Defender Remote Code Execution Vulnerability

CriticalVendor CVSS 7.8 / 10 1 CVE Published Jul 14, 2026 at 7:00 AM UTC

Summary

Integer overflow or wraparound in Microsoft Defender allows an unauthorized attacker to execute code locally.

Products covered

  • Microsoft Malware Protection Engine

Remediation

Release Notes

Vendor-listed fixes

  • 1.1.26060.3008

CVEs in this advisory 1

Updates

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.