Medium5.5Vendor: HighMicrosoft Server

Medium [CVE-2026-33842] Windows File Explorer Information Disclosure Vulnerability

This medium-severity Microsoft Server advisory covers CVE-2026-33842 affecting Windows Server 2019, Windows Server 2022, Windows Server 2025.

CVE-2026-33842 Published Jul 14, 2026Updated by vendor Jul 14, 2026

CVE-2026-33842

Affected products & platforms

Microsoft ServerWindows Server

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Summary

Windows File Explorer Information Disclosure Vulnerability

Affected products named by the advisory: Windows Server 2019; Windows Server 2022; Windows Server 2025; Windows Server 2016; and 1 more.

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

Affected versions

Windows 10 Version 1607 10.0.14393.0
Windows 10 Version 1809 10.0.17763.0
Windows 10 Version 21H2 10.0.19044.0
Windows 10 Version 22H2 10.0.19045.0
Windows 11 version 23H2 10.0.22631.0
Windows 11 Version 23H2 10.0.22631.0
Windows 11 Version 24H2 10.0.26100.0
Windows 11 Version 25H2 10.0.26200.0
Windows 11 version 26H1 10.0.28000.0
Windows Server 2012 R2 6.3.9600.0
Windows Server 2012 R2 (Server Core installation) 6.3.9600.0
Windows Server 2016 10.0.14393.0

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)
KB5099539 (build 10.0.19045.7548)
KB5099536 (build 10.0.26100.33158)
KB5101650 (build 10.0.26100.8875)
KB5099414 (build 10.0.22631.7376)
KB5101649 (build 10.0.28000.2525)
KB5099535 (build 10.0.14393.9339)

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, KB5099539, KB5099536, KB5101650, KB5099414 (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-2026-33842NVD 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: KB5099539
Official documentation
Direct download of the KB5099539 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.

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