Microsoft Patch Tuesday for September 2026 — Snort rules and prominent vulnerabilities

Microsoft has released its monthly security update for September 2026, which includes 973 vulnerabilities affecting a range of products, including 113 that Microsoft marked as "critical."

Microsoft notes that 2 of the vulnerabilities disclosed this month have been exploited in the wild:

CVE-2026-81963 affects Windows Update Stack. CVE-2026-81963 is a elevation of privilege vulnerability associated with Improper Link Resolution Before File Access ('Link Following') and Improper Access Control and has a CVSS base score of 7.8.

CVE-2026-85880 affects Windows Advanced Local Procedure Call (ALPC). CVE-2026-85880 is a elevation of privilege vulnerability associated with Heap-based Buffer Overflow and Use of Uninitialized Resource and has a CVSS base score of 7.8.

Out of 113 "critical" vulnerabilities, 82 are remote code execution (RCE) vulnerabilities.

Microsoft considers exploitation of the following vulnerabilities more likely:

CVE-2026-69676 affects Windows Kerberos. CVE-2026-69676 is a remote code execution vulnerability associated with Authentication Bypass by Capture-replay and has a CVSS base score of 8.8.

CVE-2026-69852 affects Windows Routing and Remote Access Service (RRAS). CVE-2026-69852 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 7.5.

CVE-2026-72957 affects Windows Deployment Services. CVE-2026-72957 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 7.8.

CVE-2026-69854 affects Spring Cloud Azure. CVE-2026-69854 is a elevation of privilege vulnerability associated with Improper Authentication and has a CVSS base score of 9.0.

CVE-2026-83501 affects Windows Virtualization-Based Security (VBS). CVE-2026-83501 is a information disclosure vulnerability associated with Out-of-bounds Read and has a CVSS base score of 5.5.