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CVE-2026-56165Critical

Microsoft Account Remote Code Execution Vulnerability

MSRC advisory NVD CVE.org

Assessment

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

Severity
Critical
CVSS base score
9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact
Remote Code Execution
EPSS, next 30 days
1.0%Higher than 60.6% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
Exploitability
Exploitation Less Likely
Publicly disclosed
No
Customer action
Not required (service-side fix)
Component
Microsoft Account
Weakness
CWE-122: Heap-based Buffer Overflow
Issued by
Microsoft
Published
23 Jul 2026 · July 2026
Last revised
23 Jul 2026

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

Azure
1 affected product
  • Microsoft Account
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