Is CVE-2026-50304 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-50304 being exploited in the wild.

How severe is CVE-2026-50304?

High severity, with a CVSS score of 7.5, published 14 July 2026.

Which products and versions are affected?

Microsoft Active Directory Federation Services Windows Server 2012, 2012 R2, 2016, 2019; Windows 10 1607, 1809.

Is there a fix for CVE-2026-50304?

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-2026-50304 attacked?

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

Am I affected by CVE-2026-50304?

Check whether you run Microsoft Active Directory Federation Services 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-2026-50304: Microsoft Active Directory Federation Services stack overflow DoS

CVE-2026-50304 · Severity: high · CVSS 7.5 · Published 2026-07-14

A vulnerability in Microsoft's Active Directory Federation Services (AD FS) allows an unauthorized person to crash the service remotely. AD FS is a critical component used for single sign-on and identity management across different applications. If exploited, this would prevent users from logging into corporate systems and services, causing a significant disruption to business operations.

Technologies: Microsoft Active Directory Federation Services. Vendors: Microsoft.

Quick answers

Is CVE-2026-50304 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-50304 being exploited in the wild.
How severe is CVE-2026-50304?: High severity, with a CVSS score of 7.5, published 14 July 2026.
Which products and versions are affected?: Microsoft Active Directory Federation Services Windows Server 2012, 2012 R2, 2016, 2019; Windows 10 1607, 1809.
Is there a fix for CVE-2026-50304?: 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-2026-50304 attacked?: It is attacked over the network, in an operating system.
Am I affected by CVE-2026-50304?: Check whether you run Microsoft Active Directory Federation Services 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 without authentication (AV:N/AC:L/PR:N/UI:N). An attacker can exploit this flaw by sending specially crafted requests to the AD FS endpoint, leading to a service crash and denial-of-service (DoS). The issue affects multiple versions of Windows Server and Windows 10. Microsoft has released security updates to address this vulnerability.

Affected products

Microsoft Active Directory Federation Services (AD FS) Windows Server 2012, 2012 R2, 2016, 2019; Windows 10 1607, 1809

Timeline

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

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50304

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