CVE-2026-56165 CRITICAL

CVE-2026-56165: Microsoft Account Remote Code Execution Vulnerability

Vendor Microsoft
Product Microsoft Account
Weakness CWE-122
Published July 23, 2026
Last update July 24, 2026
View on NVD All CVEs

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network.

Key dates

02Disclosure timeline

July 23, 2026 CVE published
July 24, 2026 Record updated