CVE-2026-56165
Microsoft Account Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Account Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-56165- CVSS 3.1
- 9.8 Critical
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 - Weakness
- CWE-122
- Updated
- 2026-11-02
EUVDEUVD-2026-48452
Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network.
- Record
EUVD-2026-48452- CVSS 3.1
- 9.8 Critical
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-w7fc-p5p7-c9pf
Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code...
Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network.
- Record
GHSA-w7fc-p5p7-c9pf- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
NVD
Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-56165- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-56165 is a critical vulnerability (CVSS 9.8) in Microsoft Account, published July 23, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.97%, the 62nd percentile. No source names a fixed version.