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CVE-2026-97788

Microsoft .NET Framework 3.5: Active Directory Federation Services (AD FS) Information Disclosure Vulnerability

Microsoft Microsoft .NET Framework 3.5
Open in ThreatlineRecord JSON
CVSS
7.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.68%Chance of exploitation activity in the next 30 days, higher than 51% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in2.0.50727.9188 AND 3.0.30729.9171Also 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0, 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 and 18 moreCVE List
Published13 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

  • 2.0.50727.9188 AND 3.0.30729.9171Microsoft .NET Framework 3.5CVE List
  • 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2CVE List
  • 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0Microsoft .NET Framework 3.5 AND 4.7.2CVE List
  • 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0Microsoft .NET Framework 3.5 AND 4.8CVE List
  • 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Microsoft .NET Framework 3.5 AND 4.8.1CVE List
  • 4.7.4150.0Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2CVE List
Show all 29 fixed versions
  • 4.8.4811.0Microsoft .NET Framework 4.8CVE List
  • 4.8.9363.0Microsoft .NET Framework 4.8.1CVE List
  • 10.0.14393.9612Windows 10 Version 1607CVE List
  • 10.0.17763.9376Windows 10 Version 1809CVE List
  • 10.0.19044.7807Windows 10 Version 21H2CVE List
  • 10.0.19045.7807Windows 10 Version 22H2CVE List
  • 10.0.22631.7652Windows 11 version 23H2CVE List
  • 10.0.22631.7652Windows 11 Version 23H2CVE List
  • 10.0.26100.9711Windows 11 Version 24H2CVE List
  • 10.0.26200.9711Windows 11 Version 25H2CVE List
  • 10.0.28000.3231Windows 11 version 26H1CVE List
  • 10.0.26300.9711Windows 11 Version 26H2CVE List
  • 6.2.9200.26434Windows Server 2012CVE List
  • 6.2.9200.26434Windows Server 2012 (Server Core installation)CVE List
  • 6.3.9600.23470Windows Server 2012 R2CVE List
  • 6.3.9600.23470Windows Server 2012 R2 (Server Core installation)CVE List
  • 10.0.14393.9612Windows Server 2016CVE List
  • 10.0.14393.9612Windows Server 2016 (Server Core installation)CVE List
  • 10.0.17763.9376Windows Server 2019CVE List
  • 10.0.17763.9376Windows Server 2019 (Server Core installation)CVE List
  • 10.0.20348.5761Windows Server 2022CVE List
  • 10.0.26100.33650Windows Server 2025CVE List
  • 10.0.26100.33650Windows Server 2025 (Server Core installation)CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Vendor and government advisories 1

Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

Description

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

Text from CVE List

Affected versions 29

  • Microsoft .NET Framework 3.5affected: 3.5.0 before 2.0.50727.9188 AND 3.0.30729.9171CVE List
  • Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2affected: 3.0.0.0 before 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0CVE List
  • Microsoft .NET Framework 3.5 AND 4.7.2affected: 4.7.0 before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0CVE List
  • Microsoft .NET Framework 3.5 AND 4.8affected: 4.8.0 before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0CVE List
  • Microsoft .NET Framework 3.5 AND 4.8.1affected: 4.8.1 before 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0CVE List
  • Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2affected: 4.7.0 before 4.7.4150.0CVE List
  • Microsoft .NET Framework 4.8affected: 4.8.0 before 4.8.4811.0CVE List
  • Microsoft .NET Framework 4.8.1affected: 4.8.0.0 before 4.8.9363.0CVE List
  • Windows 10 Version 1607affected: 10.0.14393.0 before 10.0.14393.9612CVE List
  • Windows 10 Version 1809affected: 10.0.17763.0 before 10.0.17763.9376CVE List
  • Windows 10 Version 21H2affected: 10.0.19044.0 before 10.0.19044.7807CVE List
  • Windows 10 Version 22H2affected: 10.0.19045.0 before 10.0.19045.7807CVE List
  • Windows 11 version 23H2affected: 10.0.22631.0 before 10.0.22631.7652CVE List
  • Windows 11 Version 23H2affected: 10.0.22631.0 before 10.0.22631.7652CVE List
  • Windows 11 Version 24H2affected: 10.0.26100.0 before 10.0.26100.9711CVE List
  • Windows 11 Version 25H2affected: 10.0.26200.0 before 10.0.26200.9711CVE List
  • Windows 11 version 26H1affected: 10.0.28000.0 before 10.0.28000.3231CVE List
  • Windows 11 Version 26H2affected: 10.0.26300.0 before 10.0.26300.9711CVE List
  • Windows Server 2012affected: 6.2.9200.0 before 6.2.9200.26434CVE List
  • Windows Server 2012 (Server Core installation)affected: 6.2.9200.0 before 6.2.9200.26434CVE List
  • Windows Server 2012 R2affected: 6.3.9600.0 before 6.3.9600.23470CVE List
  • Windows Server 2012 R2 (Server Core installation)affected: 6.3.9600.0 before 6.3.9600.23470CVE List
  • Windows Server 2016affected: 10.0.14393.0 before 10.0.14393.9612CVE List
  • Windows Server 2016 (Server Core installation)affected: 10.0.14393.0 before 10.0.14393.9612CVE List
  • Windows Server 2019affected: 10.0.17763.0 before 10.0.17763.9376CVE List
  • Windows Server 2019 (Server Core installation)affected: 10.0.17763.0 before 10.0.17763.9376CVE List
  • Windows Server 2022affected: 10.0.20348.0 before 10.0.20348.5761CVE List
  • Windows Server 2025affected: 10.0.26100.0 before 10.0.26100.33650CVE List
  • Windows Server 2025 (Server Core installation)affected: 10.0.26100.0 before 10.0.26100.33650CVE List

References 1