CVE-2026-97788: Active Directory Federation Services (AD FS) Information Disclosure Vulnerability

Published Oct 13, 2026
·
Updated

Active Directory Federation Services (AD FS) Information Disclosure Vulnerability

Other sources

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

— Microsoft

Affected Software

123 affected componentsFixes available
Microsoft Active Directory Federation Services
Microsoft .NET Framework=4.8.1
4.8.9363.0
Microsoft Windows Server 2016<10.0.14393.9612
10.0.14393.9612
Microsoft Windows Server 2019<10.0.17763.9376
10.0.17763.9376
Microsoft Windows Server 2025<10.0.26100.33650
10.0.26100.33650
Microsoft Windows Server 2012 R2<6.3.9600.23470
6.3.9600.23470
Microsoft Windows Server 2025<10.0.26100.33650
10.0.26100.33650
Microsoft Windows Server 2019<10.0.17763.9376
10.0.17763.9376
Microsoft Windows Server 2022<10.0.20348.5761
10.0.20348.5761
Microsoft Windows Server 2022<10.0.20348.5761
10.0.20348.5761
Microsoft Windows Server 2016<10.0.14393.9612
10.0.14393.9612
Microsoft Windows Server 2012 R2<6.3.9600.23470
6.3.9600.23470
Microsoft Windows Server 2012<6.2.9200.26434
6.2.9200.26434
Microsoft Windows Server 2012<6.2.9200.26434
6.2.9200.26434
Microsoft Windows 10 1607<10.0.14393.9612
Microsoft Windows 10 1607<10.0.14393.9612
Microsoft Windows 10 1809<10.0.17763.9376
Microsoft Windows 10 1809<10.0.17763.9376
Microsoft Windows 10 21h2<10.0.19044.7807
Microsoft Windows 10 21h2<10.0.19044.7807
Microsoft Windows 10 21h2<10.0.19044.7807
Microsoft Windows 10 22h2<10.0.19045.7807
Microsoft Windows 10 22h2<10.0.19045.7807
Microsoft Windows 10 22h2<10.0.19045.7807
Microsoft Windows 11 23h2<10.0.22631.7652
Microsoft Windows 11 23h2<10.0.22631.7652
Microsoft Windows 11 24h2<10.0.26100.9711
Microsoft Windows 11 24h2<10.0.26100.9711
Microsoft Windows 11 25h2<10.0.26200.9711
Microsoft Windows 11 25h2<10.0.26200.9711
Microsoft Windows 11 26h1<10.0.28000.3231
Microsoft Windows 11 26h1<10.0.28000.3231
Microsoft Windows 11 26h2<10.0.26300.9711
Microsoft Windows 11 26h2<10.0.26300.9711
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
Microsoft Windows Server 2016<10.0.14393.9612
Microsoft Windows Server 2019<10.0.17763.9376
Microsoft Windows Server 2022<10.0.20348.5761
Microsoft Windows Server 2025<10.0.26100.33650
All of the following
Microsoft .NET Framework=4.8.1
Microsoft Windows 11 26h1
All of the following
Microsoft .NET Framework=4.8
Any of the following
Microsoft Windows 10 1607
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
Microsoft Windows Server 2016
All of the following
Any of the following
Microsoft .NET Framework=4.6.2
Microsoft .NET Framework=4.7
Microsoft .NET Framework=4.7.1
Microsoft .NET Framework=4.7.2
Any of the following
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
All of the following
Any of the following
Microsoft .NET Framework=3.5
Microsoft .NET Framework=4.8.1
Any of the following
Microsoft Windows 10 21h2
Microsoft Windows 10 22h2
Microsoft Windows 11 23h2
Microsoft Windows 11 24h2
Microsoft Windows 11 25h2
Microsoft Windows 11 26h2
Microsoft Windows Server 2022
Microsoft Windows Server 2025
All of the following
Any of the following
Microsoft .NET Framework=3.5
Microsoft .NET Framework=4.8
Any of the following
Microsoft Windows 10 1809
Microsoft Windows 10 21h2
Microsoft Windows 10 22h2
Microsoft Windows Server 2019
Microsoft Windows Server 2022
All of the following
Any of the following
Microsoft .NET Framework=3.5
Microsoft .NET Framework=4.7.2
Microsoft Windows 10 1809
All of the following
Any of the following
Microsoft .NET Framework=3.5
Microsoft .NET Framework=4.6.2
Microsoft .NET Framework=4.7
Microsoft .NET Framework=4.7.1
Microsoft .NET Framework=4.7.2
Any of the following
Microsoft Windows 10 1607
Microsoft Windows Server 2016
Microsoft Windows Server 2019
All of the following
Microsoft .NET Framework=3.5
Any of the following
Microsoft Windows 11 26h1
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
Microsoft .NET Framework>=4.8<4.8.4811.0
4.8.4811.0
Microsoft .NET Framework=3.5, =4.6.2, >=4.7<4.7.4150.0, =4.7.1, =4.7.2, >=2.0.50727<2.0.50727.8987, >=3.0.30729<3.0.30729.8982
2.0.50727.89873.0.30729.89824.7.4150.0
Microsoft .NET Framework=3.5, >=4.8<4.8.4811.0, >=2.0.50727<2.0.50727.9188, >=3.0.30729<3.0.30729.9171
2.0.50727.91883.0.30729.91714.8.4811.0
Microsoft .NET Framework>=4.8<4.8.4811.0
4.8.4811.0
Microsoft .NET Framework=3.5, =4.6.2, >=4.7<4.7.4150.0, =4.7.1, =4.7.2, >=2.0.50727<2.0.50727.9073, >=3.0.30729<3.0.30729.9070
2.0.50727.90733.0.30729.90704.7.4150.0
Microsoft .NET Framework=3.5, =4.7.2, >=2.0.50727<2.0.50727.9073, >=3.0.30729<3.0.30729.9070
2.0.50727.90733.0.30729.90704.7.4150.0
Microsoft .NET Framework>=4.8<4.8.4811.0
4.8.4811.0
Microsoft .NET Framework=3.5, >=2.0.50727<2.0.50727.9188, >=3.0.30729<3.0.30729.9171
2.0.50727.91883.0.30729.9171
Microsoft .NET Framework=3.5, >=4.8<4.8.4811.0, >=2.0.50727<2.0.50727.9188, >=3.0.30729<3.0.30729.9171
2.0.50727.91883.0.30729.91714.8.4811.0
Microsoft .NET Framework=3.5, >=2.0.50727<2.0.50727.8987, >=3.0.30729<3.0.30729.8982
2.0.50727.89873.0.30729.8982
Microsoft .NET Framework=4.6.2, >=4.7<4.7.4150.0, =4.7.1, =4.7.2
4.7.4150.0
Microsoft .NET Framework=3.5, >=2.0.50727<2.0.50727.8987, >=3.0.30729<3.0.30729.8982
2.0.50727.89873.0.30729.8982
Microsoft .NET Framework=3.5, =4.8.1, >=2.0.50727<2.0.50727.9188, >=3.0.30729<3.0.30729.9171
2.0.50727.91883.0.30729.91714.8.10008.0
Microsoft .NET Framework=3.5, =4.8.1, >=2.0.50727<2.0.50727.9188, >=3.0.30729<3.0.30729.9171
2.0.50727.91883.0.30729.91714.8.9363.0
Microsoft .NET Framework=4.6.2, >=4.7<4.7.4150.0, =4.7.1, =4.7.2
4.7.4150.0
Microsoft .NET Framework=3.5, =4.8.1, >=2.0.50727<2.0.50727.9188, >=3.0.30729<3.0.30729.9171
2.0.50727.91883.0.30729.91714.8.9363.0
Microsoft .NET Framework=3.5, >=4.8<4.8.4811.0, >=2.0.50727<2.0.50727.9073, >=3.0.30729<3.0.30729.9070
2.0.50727.90733.0.30729.90704.8.4811.0
Microsoft Windows 10=1607, >=10.0.14393<10.0.14393.9612
10.0.14393.9612
Microsoft Windows 10=22H2, >=10.0.19045<10.0.19045.7807
10.0.19045.7807
Microsoft Windows 11=25H2, >=10.0.26200<10.0.26200.9711
10.0.26200.9711
Microsoft .NET Framework=3.5, =4.8.1, >=2.0.50727<2.0.50727.9188, >=3.0.30729<3.0.30729.9171
2.0.50727.91883.0.30729.91714.8.9363.0
Microsoft Windows 11=26H1, >=10.0.28000<10.0.28000.3231
10.0.28000.3231
Microsoft Windows 11=26H1, >=10.0.28000<10.0.28000.3231
10.0.28000.3231
Microsoft Windows 10=21H2, >=10.0.19044<10.0.19044.7807
10.0.19044.7807
Microsoft Windows 10=21H2, >=10.0.19044<10.0.19044.7807
10.0.19044.7807
Microsoft Windows 10=22H2, >=10.0.19045<10.0.19045.7807
10.0.19045.7807
Microsoft Windows 10=1809, >=10.0.17763<10.0.17763.9376
10.0.17763.9376
Microsoft Windows 10=1809, >=10.0.17763<10.0.17763.9376
10.0.17763.9376
Microsoft Windows 10=21H2, >=10.0.19044<10.0.19044.7807
10.0.19044.7807
Microsoft Windows 11=26H2, >=10.0.26300<10.0.26300.9711
10.0.26300.9711
Microsoft Windows 11=26H2, >=10.0.26300<10.0.26300.9711
10.0.26300.9711
Microsoft Windows 11=23H2, >=10.0.22631<10.0.22631.7652
10.0.22631.7652
Microsoft Windows 11=25H2, >=10.0.26200<10.0.26200.9711
10.0.26200.9711
Microsoft Windows 10=1607, >=10.0.14393<10.0.14393.9612
10.0.14393.9612
Microsoft Windows 11=23H2, >=10.0.22631<10.0.22631.7652
10.0.22631.7652
Microsoft Windows 10=22H2, >=10.0.19045<10.0.19045.7807
10.0.19045.7807
Microsoft Windows 11=24H2, >=10.0.26100<10.0.26100.9711
10.0.26100.9711
Microsoft Windows 11=24H2, >=10.0.26100<10.0.26100.9711
10.0.26100.9711

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.9363.0Patch KB5127691
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.14393.9612Patch KB5126868
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.17763.9376Patch KB5126651
  4. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26100.33650Patch KB5126646
  5. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 6.3.9600.23470Patch KB5126836
  6. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.20348.5761Patch KB5126655
  7. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 6.2.9200.26434Patch KB5126835
  8. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4811.0Patch KB5127684
  9. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188Fixed in 3.0.30729.9171Fixed in 4.8.4811.0Patch KB5127683
  10. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4811.0Patch KB5127688
  11. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8987Fixed in 3.0.30729.8982Fixed in 4.7.4150.0Patch KB5126868
  12. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9073Fixed in 3.0.30729.9070Fixed in 4.7.4150.0Patch KB5127666
  13. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4811.0Patch KB5127686
  14. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188Fixed in 3.0.30729.9171Patch KB5127696
  15. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.7.4150.0Patch KB5127668
  16. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188Fixed in 3.0.30729.9171Fixed in 4.8.4811.0Patch KB5127687
  17. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8987Fixed in 3.0.30729.8982Patch KB5127664
  18. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188Fixed in 3.0.30729.9171Fixed in 4.8.10008.0Patch KB5127694
  19. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8987Fixed in 3.0.30729.8982Patch KB5127660
  20. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188Fixed in 3.0.30729.9171Fixed in 4.8.9363.0Patch KB5127690
  21. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188Fixed in 3.0.30729.9171Fixed in 4.8.9363.0Patch KB5127693
  22. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.7.4150.0Patch KB5127667
  23. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9073Fixed in 3.0.30729.9070Fixed in 4.8.4811.0Patch KB5127685
  24. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188Fixed in 3.0.30729.9171Fixed in 4.8.9363.0Patch KB5127692
  25. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.19045.7807Patch KB5126657
  26. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26200.9711Patch KB5127648
  27. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188Fixed in 3.0.30729.9171Fixed in 4.8.9363.0Patch KB5127689
  28. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.28000.3231Patch KB5127646
  29. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.19044.7807Patch KB5126657
  30. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26300.9711Patch KB5127648
  31. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.22631.7652Patch KB5126653
  32. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26100.9711Patch KB5127648

Event History

Oct 13, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·07:01 PM
Data Sourced
via MITRE·07:01 PM
DescriptionSeverity
Data Sourced
via NVD·07:22 PM
DescriptionSeverityWeaknessAffected Software
Oct 18, 2026
Event
via FIRST·02:27 PM

Frequently Asked Questions

1

Who can exploit this issue?

The issue can be exploited by an unauthorized attacker over a network. No privileges or user interaction are required according to the supplied severity vector.

2

What is the likely impact of successful exploitation?

Successful exploitation allows disclosure of information. The supplied severity vector indicates high confidentiality impact, with no integrity or availability impact.

3

Which environments should be reviewed for exposure?

Review Active Directory Federation Services deployments on the listed Microsoft Windows Server versions: Windows Server 2012 R2, 2016, 2019, 2022, and 2025. The affected software list also includes Microsoft .NET Framework and Windows 10 and Windows 11.

Company

Resources

Contact

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