CVE-2026-96222Network attack vectorHinoki check available

Unauthenticated spoofing via improper certificate validation

Published Oct 13, 2026 · Updated Oct 13, 2026

Improper certificate validation in Microsoft AD FS allows remote attackers to perform spoofing through network communications. The public description does not identify the certificate check, processing routine, or crafted input involved. No authentication or user interaction is required, but the additional attack conditions and precise spoofed identity are undisclosed; no service interruption is described.

CVSS severity7.4
High
EPSS probability0.58%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper certificate validation in Microsoft AD FS allows remote attackers to perform spoofing through network communications. The public description does not identify the certificate check, processing routine, or crafted input involved. No authentication or user interaction is required, but the additional attack conditions and precise spoofed identity are undisclosed; no service interruption is described.

The record

CVE
CVE-2026-96222
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
Microsoft Corporation
Product
Windows Server 2019
Classifications
CWE-295
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.17763.0 <10.0.17763.9376

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft Corporation · Windows Server 2019version=10.0.17763.0 <10.0.17763.9376
Microsoft Corporation · Microsoft .NET Framework 3.5 and 4.8.1version=4.8.1 <2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
Microsoft Corporation · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.33650
Microsoft Corporation · Microsoft .NET Framework 3.5 and 4.8version=4.8.0 <2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
Microsoft Corporation · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.9612
Microsoft Corporation · Windows Server 2016version=10.0.14393.0 <10.0.14393.9612
Microsoft Corporation · Microsoft Visual Studio 2022 version 17.14version=17.14.0 <17.14.42
Microsoft Corporation · Microsoft Visual Studio 2026 version 18.10version=18.10.0 <18.10.4
Microsoft Corporation · Windows Server 2012 R2 (Server Core installation)version=6.3.9600.0 <6.3.9600.23470
Microsoft Corporation · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.9376
Microsoft Corporation · System.Security.Cryptography.Xmlversion=10.0.0 <8.0.5
Microsoft Corporation · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.9612
Microsoft Corporation · Windows Server 2022version=10.0.20348.0 <10.0.20348.5761
Microsoft Corporation · Windows Server 2025version=10.0.26100.0 <10.0.26100.33650
Microsoft Corporation · Microsoft .NET Framework 3.5 and 4.7.2version=4.7.0 <2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
Microsoft Corporation · Microsoft .NET Frameworkversion=3.0.0.0 <2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0; version=4.7.0 <4.7.4150.0; version=4.8.0.0 <4.8.9363.0
Microsoft Corporation · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.9376
Microsoft Corporation · Windows Server 2012 R2version=6.3.9600.0 <6.3.9600.23470
Microsoft Corporation · Microsoft .NET Framework 3.5version=3.5.0 <2.0.50727.9188 AND 3.0.30729.9171
Microsoft Corporation · Microsoft .NET Framework 4.8version=4.8.0 <4.8.4811.0

Published CVSS scores

7.4MicrosoftCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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