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Security

Microsoft security updates and public advisory evidence: affected products, fixing updates, exploitation and source coverage.

Security Update Guide CISA KEV
1474Microsoft CVEsreleased Tue 13 Oct 94Critical81 need an update · 13 fixed service-side 1Exploited in the wild
1Publicly disclosed
1In CISA KEV
256Revised since release

September 2026: 998 CVEs · 132 critical · 2 exploited · 2 in CISA KEV

Act first · October 2026

Exploited, KEV-listed, or publicly disclosed
CVE-2026-96951ImportantExploitedCISA KEV · due 16 OctSFBNetwork
Windows Shell Security Feature Bypass Vulnerability
CVSS 8.8 KB5126646KB5126651KB5126653+6
Patch next · critical, "exploitation more likely", or top 5% EPSS · needs an update183
CVSS 8.1 · EPSS 1.4% KB5128895KB5128896KB5128897+1
CVSS 8.1 · EPSS 1.0% KB5126646KB5126651KB5126653+7
CVSS 8.8 · EPSS 2.7% KB5129955KB5129956KB5129957+1
Showing 3 of 183All critical

CVEs · October 2026

349 matches · most urgent first CSVText
CVE Vulnerability Severity CVSSEPSSImpact StatusFixed by
CVE-2026-83725 Microsoft Windows Search Component Remote Code Execution VulnerabilityMicrosoft Windows Search Component Important 8.80.8%RCENetwork
KB5126646KB5126651+8
CVE-2026-83759 Windows Encrypting File System (EFS) Remote Code Execution VulnerabilityWindows Encrypting File System (EFS) Important 8.80.9%RCENetwork
KB5126646KB5126651+6
CVE-2026-83778 Microsoft Internet Messaging API Remote Code Execution VulnerabilityMicrosoft Internet Messaging API Important 8.80.9%RCENetwork
KB5126646KB5126651+8
CVE-2026-83797 Windows Partition Management Driver Remote Code Execution VulnerabilityWindows Partition Management Driver Important 8.80.9%RCENetwork
KB5126646KB5126651+5
CVE-2026-83831 Microsoft Edge (Chromium-based) Remote Code Execution VulnerabilityMicrosoft Edge (Chromium-based) Important 8.80.8%RCENetwork Revised 26 Oct
—
CVE-2026-83862 Windows Network Load Balancing Remote Code Execution VulnerabilityWindows Network Load Balancing Important 8.80.4%RCEAdjacent Revised 23 Oct
KB5126646KB5126651+4
CVE-2026-83874 Windows Event Tracing Remote Code Execution VulnerabilityWindows Event Tracing Important 8.80.9%RCENetwork
KB5126646KB5126651+8
CVE-2026-83889 Windows DNS Server Remote Code Execution VulnerabilityRole: DNS Server Important 8.81.1%RCENetwork
KB5126646KB5126651+8
CVE-2026-83891 Microsoft Office Word Remote Code Execution VulnerabilityMicrosoft Office Word Important 8.80.9%RCENetwork Revised 15 Oct
—
CVE-2026-83923 Microsoft OpenSSH for Windows Remote Code Execution VulnerabilityOpenSSH for Windows Important 8.81.0%RCENetwork Revised 4 Nov
KB5126646KB5126651+5
CVE-2026-83928 Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution VulnerabilityWindows Local Security Authority Subsystem Service (LSASS) Important 8.80.6%RCENetwork
KB5126646KB5126651+8
CVE-2026-83929 Windows GDI Remote Code Execution VulnerabilityWindows GDI Important 8.80.6%RCENetwork
KB5126646KB5126651+7

Advisories · October 2026

MSRC guidance without a CVE of its own · 1 advisory
ADV260001
Hardening changes for ReFS volumes on removable mediaStarting with Windows updates released on and after October 13, 2026, Microsoft is making hardening changes to the Resilient File System (ReFS) . This change is not enable by default until 2027. Please see Hardening changes for ReFS volumes on removable media for more information.
Published 13 Oct28 affected products
ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 11 Nov 17:22 UTC · 274 of 275 readable · 273 fully read · documentation 469/469 current

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