Heap-based Buffer Overflow in Microsoft Account Affects Microsoft
CVE-2026-56165

9.8CRITICAL

Key Information:

Vendor

Microsoft
Status
Microsoft Account
Vendor
CVE Published:
23 July 2026

What is CVE-2026-56165?

A heap-based buffer overflow vulnerability in Microsoft Account allows unauthorized attackers to execute arbitrary code when the user interacts with maliciously crafted content over a network. This could potentially enable attackers to gain control over the affected system, compromising the integrity and confidentiality of the user’s data. It is crucial for users and organizations to apply the latest patches provided by Microsoft to safeguard against this vulnerability. For more detailed information, refer to the Microsoft Advisory.

Affected Version(s)

Microsoft Account -

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.