CVE-2026-50695: Microsoft Active Directory Federation Services stack overflow denial of service

CVE-2026-50695 · Severity: high · CVSS 7.5 · Published 2026-07-14

A security vulnerability has been identified in Microsoft Active Directory Federation Services (AD FS), a service used to provide single sign-on access to systems and applications. An unauthorized attacker could exploit this flaw over the network to crash the service, leading to a denial-of-service condition. This would prevent legitimate users from logging into corporate resources and applications, potentially disrupting business operations.

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

Quick answers

Is CVE-2026-50695 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-50695 being exploited in the wild.
How severe is CVE-2026-50695?
High severity, with a CVSS score of 7.5, published 14 July 2026.
Which products and versions are affected?
Microsoft Windows 11 10.0.26100.0 to 10.0.26100.8875; Microsoft Windows 10 10.0.14393.0 to 10.0.14393.9339; Microsoft Windows Server 2012 6.2.9200.0 to 6.2.9200.26226.
Is there a fix for CVE-2026-50695?
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-2026-50695 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2026-50695?
Check whether you run Microsoft Active Directory Federation 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 stack-based buffer overflow (CWE-121) exists in Microsoft Active Directory Federation Services (AD FS). The vulnerability is reachable over the network and does not require authentication or user interaction. An attacker can exploit this by sending specially crafted requests to the AD FS endpoint, leading to memory corruption and a subsequent service crash (Denial of Service). While the primary impact is availability, stack overflows can sometimes lead to remote code execution, though only DoS is confirmed in this advisory. Microsoft has released security updates to address this issue across affected Windows and Windows Server versions.

Affected products

  • Microsoft Windows 10 Version 1607 10.0.14393.0 to 10.0.14393.9339
  • Microsoft Windows 10 Version 1809 10.0.17763.0 to 10.0.17763.9020
  • Microsoft Windows 10 Version 21H2 10.0.19044.0 to 10.0.19044.7548
  • Microsoft Windows 10 Version 22H2 10.0.19045.0 to 10.0.19045.7548
  • Microsoft Windows 11 Version 24H2 10.0.26100.0 to 10.0.26100.8875
  • Microsoft Windows Server 2012 6.2.9200.0 to 6.2.9200.26226
  • Microsoft Active Directory Federation Services

Timeline

  • 2026-07-14: disclosed
  • 2026-07-14: advisory

References

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