Source: Tenable Blog
Author: Research Special Operations
URL: https://www.tenable.com/blog/microsofts-october-2026-patch-tuesday-addresses-1407-cves-cve-2026-96951
ONE SENTENCE SUMMARY:
October 2026 Patch Tuesday fixed 1,407 Microsoft CVEs, including two zero-days, emphasizing urgent patching and end-of-support transitions across many products.
MAIN POINTS:
- Release contained 69 critical, 1,337 important, and one low vulnerability.
- Updates covered 301 products/components; Excel, DNS Server, and Windows Kernel led counts.
- Elevation of Privilege comprised 47.9% of fixes; RCE accounted for 22.3%.
- CVE-2026-96951 zero-day in Windows Shell bypassed Mark of the Web via malicious files.
- CVE-2026-108398 .NET Framework bypass allowed loading malicious assemblies to evade WDAC.
- CVE-2026-70229 AD DS RCE enabled crafted packets to execute code; exploitation more likely.
- CVE-2026-70279 Exchange spoofing relied on social engineering; admin victims risk data access/modification.
- CVE-2026-70571 Exchange RCE triggered by malicious email content-conversion; exploitation more likely.
- Additional high-risk issues included Dynamics BC RCE, BITS RCE, and multiple Windows Update EoPs.
- Support milestones: Server 2012 ESU ended; Server 2022 moved to extended support through 2031.
TAKEAWAYS:
- Prioritize rapid deployment of this month’s fixes for high-impact, likely-exploited attack paths.
- Reduce attachment-driven compromise by strengthening MOTW-related handling and user file execution controls.
- Reassess application control posture to ensure WDAC protections aren’t undermined by assembly registration.
- Accelerate upgrade projects for products that no longer receive security updates to avoid permanent exposure.
- Operationalize continuous verification using scanning and Tenable plugin IDs 192813, 182965, and 192817.