---
id: CVE-2026-97788
title: >-
  Observable discrepancy in Active Directory Federation Services (AD FS) allows
  an unauthorized attacker to disclose information over a network.
summary: >-
  Observable discrepancy in Active Directory Federation Services (AD FS) allows
  an unauthorized attacker to disclose information over a network.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-203
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T20:19:40.420'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97788'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97788'
    label: secure@microsoft.com
tags:
  - nvd
ingestedAt: '2026-10-13T19:43:29.305Z'
---

## Overview

Observable discrepancy in Active Directory Federation Services (AD FS) allows an unauthorized attacker to disclose information over a network.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.