CVE-2026-97788: Microsoft Active Directory Federation Services information disclosure

CVE-2026-97788 · Severity: high · CVSS 7.5 · Published 2026-10-13

Active Directory Federation Services (AD FS) is a Microsoft authentication system that manages user identity and access across enterprise networks. An observable discrepancy in the system allows an attacker to infer sensitive information without authorization, potentially exposing credentials or authentication tokens over the network.

Technologies: Microsoft .NET Framework, Microsoft Active Directory Federation Services, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1, Microsoft Windows 11 26h2, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025. Vendors: Microsoft.

Quick answers

Is CVE-2026-97788 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-97788 being exploited in the wild.
How severe is CVE-2026-97788?
High severity, with a CVSS score of 7.5, published 13 October 2026.
Which products and versions are affected?
Microsoft Active Directory Federation Services.
Is there a fix for CVE-2026-97788?
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-2026-97788 attacked?
It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-97788?
Check whether you run Microsoft .NET Framework, Microsoft Active Directory Federation Services, Microsoft Windows 10 1607 or one of the others listed. 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

The vulnerability is an information disclosure issue in AD FS caused by observable discrepancies in system behavior or response timing. An unauthorized attacker on the network can exploit this to infer sensitive information, likely related to authentication or token generation. A network-based attack vector is sufficient; no prior authentication is required.

Affected products

  • Microsoft Active Directory Federation Services

Timeline

  • 2026-10-13: advisory

References

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