CVE-2026-97788: Active Directory Federation Services (AD FS) Information Disclosure Vulnerability
This Microsoft advisory covers CVE-2026-97788 in Windows Server 2012 R2, Windows Server 2016 and Windows Server 2019.
- CVE-2026-97788
Key facts
- Vendor rating
- High, CVSS 7.5
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Microsoft .NET Framework 3.5 3.5.0 before 2.0.50727.9188 AND 3.0.30729.9171; Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 3.0.0.0 before 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0; Microsoft .NET Framework 3.5 AND 4.7.2 4.7.0 before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 and 9 more below
- Fixed in
- KB5126868 (build 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0), KB5126835 (build 6.2.9200.26434), KB5126657 (build 10.0.19045.7807) and 5 more below
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
Active Directory Federation Services (AD FS) Information Disclosure Vulnerability
Affected products named by the advisory: Windows Server 2012; Windows Server 2012 R2; Windows Server 2016; Windows Server 2019; and 4 more.
Affected products named by the advisory: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025; Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022.
Text from the source record.
- Microsoft .NET Framework 3.5 3.5.0 before 2.0.50727.9188 AND 3.0.30729.9171
- Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 3.0.0.0 before 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0
- Microsoft .NET Framework 3.5 AND 4.7.2 4.7.0 before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
- Microsoft .NET Framework 3.5 AND 4.8 4.8.0 before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
- Microsoft .NET Framework 3.5 AND 4.8.1 4.8.1 before 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
- Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.0 before 4.7.4150.0
- Microsoft .NET Framework 4.8 4.8.0 before 4.8.4811.0
- Microsoft .NET Framework 4.8.1 4.8.0.0 before 4.8.9363.0
- Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.9612
- Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.9376
- Windows 10 Version 21H2 10.0.19044.0 before 10.0.19044.7807
- Windows 10 Version 22H2 10.0.19045.0 before 10.0.19044.7807
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-97788
Upgrade to a fixed release named by Microsoft:
- KB5126868 (build 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0)
- KB5126835 (build 6.2.9200.26434)
- KB5126657 (build 10.0.19045.7807)
- KB5126653 (build 10.0.22631.7652)
- KB5127648 (build 10.0.26300.9711)
- KB5127646 (build 10.0.28000.3231)
- KB5126836 (build 6.3.9600.23470)
- KB5126651 (build 10.0.17763.9376)
Vendor guidance
- Install the applicable security update for your platform: KB5126868, KB5126835, KB5126657, KB5126653, KB5127648, KB5127646 (see the Microsoft Update Catalog).
End-of-life dates for Windows Server
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