Is CVE-2026-50366 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-50366 being exploited in the wild.

How severe is CVE-2026-50366?

Medium severity, with a CVSS score of 6.5, published 14 July 2026.

Which products and versions are affected?

Microsoft Windows 11 24H2, 25H2, 26H1; Microsoft Windows 10 1607, 1809, 21H2, 22H2; Microsoft Windows Server 2012 All editions.

Is there a fix for CVE-2026-50366?

A patch was published on 2026-07-14: Security updates made available via Microsoft Security Update Guide. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-50366 attacked?

It is attacked over the network, in an operating system.

Am I affected by CVE-2026-50366?

Check whether you run Microsoft Active Directory Domain Services, Microsoft Windows 11, Microsoft Windows 10 or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-50366: Microsoft Active Directory Domain Services DoS via NULL pointer dereference

CVE-2026-50366 · Severity: medium · CVSS 6.5 · Published 2026-07-14

A vulnerability in Microsoft Active Directory Domain Services could allow an authorized user to crash the service remotely. Active Directory is the central system used by organizations to manage users, computers, and security permissions. If exploited, this could lead to a significant service outage, preventing users from logging in or accessing corporate resources.

Technologies: Microsoft Active Directory Domain Services, Microsoft Windows 11, Microsoft Windows 10, Microsoft Windows Server 2012. Vendors: Microsoft.

Quick answers

Is CVE-2026-50366 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-50366 being exploited in the wild.
How severe is CVE-2026-50366?: Medium severity, with a CVSS score of 6.5, published 14 July 2026.
Which products and versions are affected?: Microsoft Windows 11 24H2, 25H2, 26H1; Microsoft Windows 10 1607, 1809, 21H2, 22H2; Microsoft Windows Server 2012 All editions.
Is there a fix for CVE-2026-50366?: A patch was published on 2026-07-14: Security updates made available via Microsoft Security Update Guide. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-50366 attacked?: It is attacked over the network, in an operating system.
Am I affected by CVE-2026-50366?: Check whether you run Microsoft Active Directory Domain Services, Microsoft Windows 11, Microsoft Windows 10 or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A NULL pointer dereference vulnerability (CWE-476) exists in Microsoft Active Directory Domain Services. An authenticated attacker with low privileges can trigger this flaw by sending a specially crafted request over the network to a domain controller. Successful exploitation causes the service to crash, resulting in a denial-of-service (DoS) condition. The vulnerability affects multiple versions of Windows and Windows Server, and Microsoft has released security updates to address the issue.

Affected products

Microsoft Windows 10 1607, 1809, 21H2, 22H2
Microsoft Windows 11 24H2, 25H2, 26H1
Microsoft Windows Server 2012 All editions
Microsoft Active Directory Domain Services

Timeline

2026-07-14: advisory: Initial advisory published by Microsoft and NVD.
2026-07-14: patched: Security updates made available via Microsoft Security Update Guide.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50366

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