CVE-2026-55011 HIGH

CVE-2026-55011: Microsoft Defender Remote Code Execution Vulnerability

Vendor Microsoft
Product Microsoft Malware Protection Engine
Weakness CWE-191
Published July 14, 2026
Last update July 24, 2026
View on NVD All CVEs

CVSS base score

7.8/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

What the vulnerability does

01Description

Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.

Key dates

02Disclosure timeline

July 14, 2026 CVE published
July 24, 2026 Record updated