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

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Microsoft Microsoft Account affected
Version Status Constraints
- affected —

No data.

No data.

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Project Subscriptions

Vendors Products
Microsoft Subscribe
Microsoft Account Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56165 cve-icon
History

Fri, 24 Jul 2026 00:30:00 +0000

Type Values Removed Values Added
Description Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network.
Title Microsoft Account Remote Code Execution Vulnerability
First Time appeared Microsoft
Microsoft microsoft Account
Weaknesses CWE-122
CPEs cpe:2.3:a:microsoft:microsoft_account:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft microsoft Account
References
Metrics cvssV3_1

{'score': 9.8, '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-07-23T23:55:12.338Z

Reserved: 2026-06-19T13:53:31.989Z

Link: CVE-2026-56165

cve-icon Vulnrichment

No data.

cve-icon NVD

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cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses