● Patch Tuesday · September 2026

Windows Patch Tuesday Breakdown: September 2026

Executive and developer triage of Microsoft's September 2026 Patch Tuesday: 79 CVEs filtered down to the critical actively exploited zero-days.

79
Total CVEs Resolved
1
In-The-Wild Zero-Day
5
Critical Remote Code Executions
High
Exploitation Urgency

Executive Triage & Risk Verdict

Microsoft's September 2026 security release addresses 79 vulnerabilities across the Windows Kernel, Desktop Window Manager, and Hyper-V. The critical priority for all IT and DevOps teams is CVE-2024-30051, an actively exploited zero-day in the Desktop Window Manager (DWM) that allows unprivileged local attackers or initial-access malware (QakBot) to gain complete SYSTEM privileges.

Curated Vulnerability Triage Matrix

CVE Identifier Subsystem / Component Impact CVSS In-The-Wild Exploitation?
CVE-2024-30051Desktop Window ManagerElevation of Privilege7.8 HighYES (In-The-Wild)
CVE-2024-38014Windows InstallerElevation of Privilege7.8 HighNo
CVE-2024-38018Windows Hyper-VRemote Code Execution8.5 HighNo
CVE-2024-38119Windows MSHTML PlatformSecurity Feature Bypass5.4 MediumYES (Prior Campaign)
FEATURED CODE TEARDOWN

Deep Dive: CVE-2024-30051 DWM Core Library Heap Overflow Teardown →

Read our line-by-line decompiled C source code analysis showing how an unchecked 32-bit addition allowed local malware to corrupt kernel heap pool structures.

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