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

52 affected componentsFixes available
Microsoft Active Directory Federation Services
Microsoft .NET Framework=4.8
4.8.4811.0
Microsoft .NET Framework=3.5, =4.8
2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0
Microsoft .NET Framework=4.8
4.8.4811.0
Microsoft .NET Framework=3.5, =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 .NET Framework=3.5, =4.8
2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
Microsoft .NET Framework=3.5, =4.8
2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0
Microsoft .NET Framework=4.6.2, =4.7, =4.7.1, =4.7.2
4.7.4150.0
Microsoft .NET Framework=3.5
2.0.50727.8987 AND 3.0.30729.8982
Microsoft .NET Framework=4.8
4.8.4811.0
Microsoft .NET Framework=3.5, =4.6.2, =4.7, =4.7.1, =4.7.2
2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
Microsoft .NET Framework=4.6.2, =4.7, =4.7.1, =4.7.2
4.7.4150.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.10008.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
Microsoft .NET Framework=3.5, =4.7.2
2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
Microsoft .NET Framework=3.5
2.0.50727.9188 AND 3.0.30729.9171
Microsoft .NET Framework=4.8.1
4.8.9363.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
Microsoft Windows Server 2016<10.0.14393.9612
10.0.14393.9612
Microsoft .NET Framework=3.5
2.0.50727.8987 AND 3.0.30729.8982
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 11=25H2
10.0.26200.9711
Microsoft Windows 10=1607
10.0.14393.9612
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
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 2022<10.0.20348.5761
10.0.20348.5761
Microsoft Windows Server 2022<10.0.20348.5761
10.0.20348.5761
Microsoft Windows 10=22H2
10.0.19044.7807
Microsoft Windows 10=1809
10.0.17763.9376
Microsoft Windows 10=21H2
10.0.19044.7807
Microsoft Windows Server 2016<10.0.14393.9612
10.0.14393.9612
Microsoft Windows 11=26H1
10.0.28000.3231
Microsoft Windows 10=1809
10.0.17763.9376
Microsoft Windows Server 2012 R2<6.3.9600.23470
6.3.9600.23470
Microsoft Windows 10=21H2
10.0.19044.7807
Microsoft Windows 11=26H1
10.0.28000.3231
Microsoft Windows 10=22H2
10.0.19044.7807
Microsoft Windows 11=26H2
10.0.26300.9711
Microsoft Windows 10=21H2
10.0.19044.7807
Microsoft Windows 11=25H2
10.0.26200.9711
Microsoft Windows 11=26H2
10.0.26300.9711
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 11=23H2
10.0.22631.7652
Microsoft Windows 10=1607
10.0.14393.9612
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 10=22H2
10.0.19044.7807

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 4.8.4811.0Patch KB5127686
  2. Upgrade

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

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0Patch KB5127687
  3. Upgrade

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

    Fixed in 4.8.4811.0Patch KB5127684
  4. Upgrade

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

    Fixed in 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0Patch KB5126868
  5. Upgrade

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

    Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0Patch KB5127685
  6. Upgrade

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

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0Patch KB5127683
  7. Upgrade

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

    Fixed in 4.7.4150.0Patch KB5127667
  8. Upgrade

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

    Fixed in 2.0.50727.8987 AND 3.0.30729.8982Patch KB5127664
  9. Upgrade

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

    Fixed in 4.8.4811.0Patch KB5127688
  10. Upgrade

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

    Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0Patch KB5127666
  11. Upgrade

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

    Fixed in 4.7.4150.0Patch KB5127668
  12. Upgrade

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

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.10008.0Patch KB5127694
  13. Upgrade

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

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Patch KB5127693
  14. Upgrade

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

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171Patch KB5127696
  15. Upgrade

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

    Fixed in 4.8.9363.0Patch KB5127691
  16. Upgrade

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

    Fixed in 10.0.14393.9612Patch KB5126868
  17. Upgrade

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

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Patch KB5127692
  18. Upgrade

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

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Patch KB5127690
  19. Upgrade

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

    Fixed in 2.0.50727.8987 AND 3.0.30729.8982Patch KB5127660
  20. Upgrade

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

    Fixed in 10.0.17763.9376Patch KB5126651
  21. Upgrade

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

    Fixed in 10.0.26100.33650Patch KB5126646
  22. Upgrade

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

    Fixed in 6.3.9600.23470Patch KB5126836
  23. Upgrade

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

    Fixed in 10.0.26200.9711Patch KB5127648
  24. Upgrade

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

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Patch KB5127689
  25. Upgrade

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

    Fixed in 10.0.20348.5761Patch KB5126655
  26. Upgrade

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

    Fixed in 10.0.19044.7807Patch KB5126657
  27. Upgrade

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

    Fixed in 10.0.28000.3231Patch KB5127646
  28. Upgrade

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

    Fixed in 10.0.26300.9711Patch KB5127648
  29. Upgrade

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

    Fixed in 6.2.9200.26434Patch KB5126835
  30. Upgrade

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

    Fixed in 10.0.22631.7652Patch KB5126653
  31. 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

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

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