CVE-2026-56165: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft Account
Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability is a heap-based buffer overflow in Microsoft Account, enabling remote code execution by an unauthenticated attacker over the network. The CVSS vector indicates no privileges or user interaction are required, and the vulnerability affects confidentiality, integrity, and availability with critical severity. Microsoft has published an official fix for this vulnerability as detailed in their security advisory.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely with no privileges or user interaction required, potentially leading to full system compromise including loss of confidentiality, integrity, and availability of affected systems.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56165 to remediate this vulnerability.
CVE-2026-56165: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft Account
Description
Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network.
CVSS v3.1
Score 9.8critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is a heap-based buffer overflow in Microsoft Account, enabling remote code execution by an unauthenticated attacker over the network. The CVSS vector indicates no privileges or user interaction are required, and the vulnerability affects confidentiality, integrity, and availability with critical severity. Microsoft has published an official fix for this vulnerability as detailed in their security advisory.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely with no privileges or user interaction required, potentially leading to full system compromise including loss of confidentiality, integrity, and availability of affected systems.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56165 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-19T13:53:31.989Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56165","vendor":"Microsoft"}]
Threat ID: 6a62b3ff9c2644c7f8000d54
Added to database: 07/24/2026, 00:38:23 UTC
Last enriched: 08/15/2026, 13:37:42 UTC
Last updated: 09/04/2026, 22:52:13 UTC
Views: 191
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