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Fencer Vulns
high 7.4

CVE-2026-96222 json

Active Directory Federation Services (AD FS) Spoofing Vulnerability

published 2026-10-13 26 d ago modified 2026-10-31 8 d ago also BIT-dotnet-2026-96222 , BIT-dotnet-sdk-2026-96222 , EUVD-2026-99750 , GHSA-vrv5-2jg9-4mmr

cvss
7.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.

Patch / fix

  • nuget System.Security.Cryptography.Xml 8.0.5
  • bitnami dotnet 8.0.5
  • bitnami dotnet-sdk 8.0.5
  • Microsoft Microsoft .NET Framework 3.5 2.0.50727.9188 AND 3.0.30729.9171
  • Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0
  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
  • Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.4150.0
  • Microsoft Microsoft .NET Framework 4.8 4.8.4811.0
  • Microsoft Microsoft .NET Framework 4.8.1 4.8.9363.0
  • Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.42
  • Microsoft Microsoft Visual Studio 2026 version 18.10 18.10.4
  • Microsoft System.Security.Cryptography.Xml 8.0.5
  • Microsoft Windows 10 Version 1607 10.0.14393.9612
  • Microsoft Windows 10 Version 1809 10.0.17763.9376
  • Microsoft Windows Server 2012 R2 6.3.9600.23470
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.23470
  • Microsoft Windows Server 2016 10.0.14393.9612
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.9612
  • Microsoft Windows Server 2019 10.0.17763.9376
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.9376
  • Microsoft Windows Server 2022 10.0.20348.5761
  • Microsoft Windows Server 2025 10.0.26100.33650
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.33650
  • dotnet8 Ubuntu 22.04 LTS 8.0.132-8.0.32-0ubuntu1~22.04.1
  • dotnet8 Ubuntu 24.04 LTS 8.0.132-8.0.32-0ubuntu1~24.04.1

ubuntu advisories UBUNTU-CVE-2026-96222

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • dotnet8.0 hummingbird 1 8.0.132-0.1.hum1
  • dotnet-sdk-8.0 hummingbird 1 8.0.132-0.1.hum1
  • dotnet-hostfxr-8.0 hummingbird 1 8.0.32-0.1.hum1
  • dotnet-runtime-8.0 hummingbird 1 8.0.32-0.1.hum1
  • dotnet-sdk-dbg-8.0 hummingbird 1 8.0.132-0.1.hum1
  • dotnet-templates-8.0 hummingbird 1 8.0.132-0.1.hum1
  • aspnetcore-runtime-8.0 hummingbird 1 8.0.32-0.1.hum1
  • dotnet-runtime-dbg-8.0 hummingbird 1 8.0.32-0.1.hum1

red hat advisories RHSA-2026:84693

  • dotnet-sdk-8.0 AlmaLinux 8 8.0.132-2.el8_10
  • dotnet-hostfxr-8.0 AlmaLinux 8 8.0.32-2.el8_10
  • dotnet-runtime-8.0 AlmaLinux 8 8.0.32-2.el8_10
  • dotnet-sdk-dbg-8.0 AlmaLinux 8 8.0.132-2.el8_10
  • dotnet-templates-8.0 AlmaLinux 8 8.0.132-2.el8_10
  • aspnetcore-runtime-8.0 AlmaLinux 8 8.0.32-2.el8_10
  • dotnet-runtime-dbg-8.0 AlmaLinux 8 8.0.32-2.el8_10
  • dotnet-apphost-pack-8.0 AlmaLinux 8 8.0.32-2.el8_10

almalinux advisories ALSA-2026:86594ALSA-2026:86168ALSA-2026:86169

  • dotnet8.0 Rocky Linux 10 8.0.132-1.el10_2
  • dotnet8.0 Rocky Linux 9 8.0.132-1.el9_8
  • dotnet8.0 Rocky Linux 8 8.0.132-2.el8_10

rocky linux advisories RLSA-2026:86168RLSA-2026:86169RLSA-2026:86594

  • dotnet8-runtime Alpine 3.24, Alpine 3.23, Alpine 3.22 8.0.32-r0

alpine advisories ALPINE-CVE-2026-96222

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-96222 updated cvss 7.4

dotnet8.0: Active Directory Federation Services (AD FS) Spoofing Vulnerability

  • Red Hat CodeReady Linux Builder EUS (v.9.6) dotnet-sdk-8.0-source-built-artifacts 8.0.132-1.el9_6
    fixed: vendor fix RHSA-2026:88422
  • Red Hat Enterprise Linux AppStream (v. 8) dotnet8.0 8.0.132-2.el8_10, dotnet-sdk-8.0 8.0.132-2.el8_10, dotnet-hostfxr-8.0 8.0.32-2.el8_10, dotnet-runtime-8.0 8.0.32-2.el8_10, dotnet-sdk-dbg-8.0 8.0.132-2.el8_10, dotnet-templates-8.0 8.0.132-2.el8_10, +6 more
    fixed: vendor fix RHSA-2026:86594
  • Red Hat Enterprise Linux AppStream (v. 9) dotnet8.0 8.0.132-1.el9_8, dotnet-sdk-8.0 8.0.132-1.el9_8, dotnet-hostfxr-8.0 8.0.32-1.el9_8, dotnet-runtime-8.0 8.0.32-1.el9_8, dotnet-sdk-dbg-8.0 8.0.132-1.el9_8, dotnet-templates-8.0 8.0.132-1.el9_8, +6 more
    fixed: vendor fix RHSA-2026:86169
  • Red Hat Enterprise Linux AppStream (v. 10) dotnet8.0 8.0.132-1.el10_2, dotnet-sdk-8.0 8.0.132-1.el10_2, dotnet-hostfxr-8.0 8.0.32-1.el10_2, dotnet-runtime-8.0 8.0.32-1.el10_2, dotnet-sdk-dbg-8.0 8.0.132-1.el10_2, dotnet-templates-8.0 8.0.132-1.el10_2, +6 more
    fixed: vendor fix RHSA-2026:86168
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) dotnet8.0 8.0.132-1.el9_4, dotnet-host 8.0.32-1.el9_4, dotnet-sdk-8.0 8.0.132-1.el9_4, dotnet-hostfxr-8.0 8.0.32-1.el9_4, dotnet-runtime-8.0 8.0.32-1.el9_4, dotnet-sdk-dbg-8.0 8.0.132-1.el9_4, +8 more
    fixed: vendor fix RHSA-2026:88425
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) dotnet8.0 8.0.132-1.el10_0, dotnet-sdk-8.0 8.0.132-1.el10_0, dotnet-hostfxr-8.0 8.0.32-1.el10_0, dotnet-runtime-8.0 8.0.32-1.el10_0, dotnet-sdk-dbg-8.0 8.0.132-1.el10_0, dotnet-templates-8.0 8.0.132-1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:88474
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) dotnet8.0 8.0.132-1.el9_6, dotnet-sdk-8.0 8.0.132-1.el9_6, dotnet-hostfxr-8.0 8.0.32-1.el9_6, dotnet-runtime-8.0 8.0.32-1.el9_6, dotnet-sdk-dbg-8.0 8.0.132-1.el9_6, dotnet-templates-8.0 8.0.132-1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:88422
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-8.0-source-built-artifacts 8.0.132-1.el9_8
    fixed: vendor fix RHSA-2026:86169
show 5 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-8.0-source-built-artifacts 8.0.132-1.el10_2
    fixed: vendor fix RHSA-2026:86168
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) dotnet-sdk-8.0-source-built-artifacts 8.0.132-1.el10_0
    fixed: vendor fix RHSA-2026:88474
  • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-8.0-source-built-artifacts 8.0.132-2.el8_10
    fixed: vendor fix RHSA-2026:86594
  • Red Hat Hardened Images dotnet8.0 8.0.132-0.1.hum1, dotnet-sdk-8.0 8.0.132-0.1.hum1, dotnet-sdk-dbg-8.0 8.0.132-0.1.hum1, dotnet-templates-8.0 8.0.132-0.1.hum1, dotnet-sdk-8.0-source-built-artifacts 8.0.132-0.1.hum1
    fixed: vendor fix RHSA-2026:84693
  • Red Hat Hardened Images dotnet-hostfxr-8.0 8.0.32-0.1.hum1, dotnet-runtime-8.0 8.0.32-0.1.hum1, aspnetcore-runtime-8.0 8.0.32-0.1.hum1, dotnet-runtime-dbg-8.0 8.0.32-0.1.hum1, dotnet-apphost-pack-8.0 8.0.32-0.1.hum1, dotnet-targeting-pack-8.0 8.0.32-0.1.hum1, +2 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
32 d ago

Exploit prediction

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
GitHub 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CNA 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
OSV 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
nuget System.Security.Cryptography.Xml
>=8.0.0, <8.0.5
8.0.5
bitnami dotnet
>=8.0.0, <8.0.5
8.0.5
bitnami dotnet-sdk
>=8.0.0, <8.0.5
8.0.5

Affected products

  • Microsoft Microsoft .NET Framework 3.5
  • Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2
  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8.1
  • Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2
  • Microsoft Microsoft .NET Framework 4.8
  • Microsoft Microsoft .NET Framework 4.8.1
  • Microsoft Microsoft Visual Studio 2022 version 17.14
  • Microsoft Microsoft Visual Studio 2026 version 18.10
  • Microsoft System.Security.Cryptography.Xml
  • Microsoft Windows 10 Version 1607
  • Microsoft Windows 10 Version 1809
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2012 R2 (Server Core installation)
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2016 (Server Core installation)
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows Server 2022
  • Microsoft Windows Server 2025
  • Microsoft Windows Server 2025 (Server Core installation)

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.