Medium4.8Vendor: HighMicrosoft Server

Medium [CVE-2026-50684] Active Directory Federation Server Spoofing Vulnerability

This medium-severity Microsoft Server advisory covers CVE-2026-50684 affecting Windows Server 2019, Windows Server 2022, Windows Server 2025.

CVE-2026-50684 Published Jul 14, 2026

CVE-2026-50684

Affected products & platforms

Microsoft ServerWindows Server

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Summary

Active Directory Federation Server Spoofing Vulnerability

Affected products named by the advisory: Windows Server 2019; Windows Server 2022; Windows Server 2025; Windows Server 2016; and 2 more.

Affected products named by the advisory: Windows Server 2012 R2.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Fixed versions

KB5099538 (build 10.0.17763.9020)
KB5099540 (build 10.0.20348.5386)
KB5099536 (build 10.0.26100.33158)
KB5099535 (build 10.0.14393.9339)
KB5099445 (build 6.2.9200.26226)
KB5099444 (build 6.3.9600.23291)

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Install the applicable security update for your platform: KB5099538, KB5099540, KB5099536, KB5099535, KB5099445, KB5099444 (see the Microsoft Update Catalog).

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Microsoft Security Update Guide (MSRC)official
Official vendor source used to discover this advisory; it remains the authority for affected products and remediation. Discovered from the machine-readable feed https://api.msrc.microsoft.com/cvrf/v3.0/updates; this link opens the Microsoft Server advisory index instead of the raw feed document.
Microsoft Server
Official vendor advisoryofficial
Official advisory page fetched and parsed for the summary, affected/fixed versions and remediation guidance it provides.
Microsoft Server
CVE.org CNA affected-product recordCVE.org
Structured CNA affected[] data independently confirmed the affected product scope; native advisory content remains authoritative.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-50684NVD CVE.org MITRE

Official resources

Microsoft Update Catalog: KB5099538
Official documentation
Direct download of the KB5099538 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5099540
Official documentation
Direct download of the KB5099540 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5099536
Official documentation
Direct download of the KB5099536 security update named in the MSRC remediation data for this CVE.
MSRC Security Update Guide
Official documentation
Filter by this CVE for per-product KB numbers, severity and exploitability assessment.

Discussion(0)

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