CVE-2026-50368: Microsoft Active Directory Federation Services stack overflow denial of service

CVE-2026-50368 · Severity: high · CVSS 7.5 · Published 2026-07-14

A vulnerability in Microsoft's identity management service, Active Directory Federation Services (AD FS), could allow an attacker to crash the service remotely. AD FS is used by organizations to provide single sign-on access to applications and systems; if this service is disabled, users may be unable to log in to critical business tools. This attack can be carried out over the network without needing any valid user credentials.

Technologies: Microsoft Active Directory Federation Services, Microsoft Windows Server 2012 R2, Microsoft Windows 10, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019. Vendors: Microsoft.

Quick answers

Is CVE-2026-50368 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-50368 being exploited in the wild.
How severe is CVE-2026-50368?
High severity, with a CVSS score of 7.5, published 14 July 2026.
Which products and versions are affected?
Microsoft Windows 10 Multiple versions prior to July 2026 updates; Microsoft Windows Server 2012 Multiple versions prior to July 2026 updates.
Is there a fix for CVE-2026-50368?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-50368 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2026-50368?
Check whether you run Microsoft Active Directory Federation Services, Microsoft Windows Server 2012 R2, 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 stack-based buffer overflow (CWE-121) exists in Microsoft Active Directory Federation Services (AD FS). The vulnerability is triggered when the service processes specially crafted network requests, leading to memory corruption on the stack. An unauthenticated attacker can exploit this over the network (AV:N) with low complexity (AC:L) to crash the AD FS service, resulting in a complete loss of availability for authentication services. Microsoft has released security updates to address this issue across affected Windows and Windows Server versions.

Affected products

  • Microsoft Windows 10 Version 1607 / 1809 Multiple versions prior to July 2026 updates
  • Microsoft Windows Server 2012 / 2012 R2 / 2016 / 2019 Multiple versions prior to July 2026 updates
  • Microsoft Active Directory Federation Services (AD FS)

Timeline

  • 2026-07-14: disclosed
  • 2026-07-14: advisory: Microsoft released security updates for this vulnerability.

References

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