CVE-2026-56165CWE-122

Microsoft Account Remote Code Execution Vulnerability

Critical · published July 23, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
61.7
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
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
CVSS v4.0
Not supplied
EPSS
0.00974 · 61.7th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2026-07-23T23:55Z
EPSS history
Timeline
  • 23 JUL 23:55Z
    Microsoft Account Remote Code Execution Vulnerability
    cvelistv5