CVE-2026-56165
Received Received - Intake

Heap-based Buffer Overflow in Microsoft Account

Publication date: 2026-07-24

Last updated on: 2026-07-24

Assigner: Microsoft Corporation

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

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Meta Information

Published
2026-07-24
Last Modified
2026-07-24
Generated
2026-07-24
AI Q&A
2026-07-24
EPSS Evaluated
N/A
NVD
CVE-2026-56165

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft account *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

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Executive Summary

This is a heap-based buffer overflow vulnerability in Microsoft Account. It allows an unauthorized attacker to execute arbitrary code remotely over a network without needing user interaction or elevated privileges.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially stealing data, installing malware, or taking control of your device. Since it requires no user interaction, it is highly dangerous.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Organizations must address it to maintain compliance.

Mitigation Strategies

Apply the latest security updates from Microsoft immediately to patch the heap-based buffer overflow in Microsoft Account. Monitor Microsoft's security advisories for patches and verify their installation on all affected systems.

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