CVE-2026-56165 Microsoft Account Remote Code Execution Vulnerability
An unauthorized attacker can execute code remotely via a heap-based buffer overflow in Microsoft Account services.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56165?
CVE-2026-56165 is a critical memory corruption vulnerability in Microsoft Account, published on 23 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network.
Weakness: CWE-122
Which versions are affected by CVE-2026-56165?
It affects 1 product.
Products include Microsoft Account.
How do I fix CVE-2026-56165?
No fix has been published for CVE-2026-56165 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-56165 being exploited?
There is no known exploitation of CVE-2026-56165 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Account
Sources
Also known as GHSA-w7fc-p5p7-c9pf.