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KB5095051BMonthly security release (Patch Tuesday) · 2026-06 B

Monthly security release (Patch Tuesday) for Windows 11, version 26H1

Support article Update Catalog CVEs in Security CVE list for a ticket

Is it safe to deploy?

Everything in the June 2026 Patch Tuesday cycle
1Windows version
6CVEs fixed · 1 critical
0Exploited or in CISA KEV
0Open known issues affecting it
YesRestart required (per MSRC)

Applies to

From Microsoft's release-information tables
Servicing branchOS buildReleaseAvailable
Windows 11, version 26H1 28000.2269 B 2026-06 B 9 Jun 2026

Known issues in this update

Windows release health

No known issues listed

Windows release health lists no issues from this KB or the update it builds on.

Issues this update resolves

No resolved issues listed

Windows release health names no issues fixed by this KB.

Security fixes

6 Microsoft CVEs · most urgent first
CVE Vulnerability Severity CVSSEPSSImpact Status
CVE-2026-42982 Windows Secure Kernel Mode Elevation of Privilege VulnerabilityWindows Secure Kernel Mode Critical 7.80.3%Elevation of Privilege
CVE-2026-42990 SQL Server ODBC driver Elevation of Privilege VulnerabilitySQL Server ODBC driver Important 9.81.0%Remote Code Execution
CVE-2026-44800 Windows Push Notifications Elevation of Privilege VulnerabilityWindows Push Notifications Important 7.80.2%Elevation of Privilege
CVE-2026-40378 Windows Local Security Authority Subsystem Service (LSASS) Denial of Service VulnerabilityWindows Local Security Authority Subsystem Service (LSASS) Important 7.51.2%Denial of Service
CVE-2026-48571 Windows App Package Installer Elevation of Privilege VulnerabilityWindows App Installer Important 7.00.3%Elevation of Privilege
CVE-2026-48572 Windows App Package Installer Elevation of Privilege VulnerabilityWindows App Installer Important 7.00.2%Elevation of Privilege
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