October 2026 Microsoft Patch Tuesday, (Tue, Oct 13th)

October 2026 Microsoft Patch Tuesday

Published

2026-10-13. Last Updated

2026-10-13 19:25:52 UTC

by Johannes Ullrich (Version: 1)

1 comment(s)

Microsoft today released patches for 1,417 vulnerabilities. 76 of these vulnerabilities are rated critical, with 7 critical vulnerabiilties requiring no customer actions. One vulnerability was disclosed before today’s patch Tuesday, and one is already exploited.

CVE-2026-96951

An already exploited Windows Shell Security Feature Bypass Vulnerability. This vulnerabliity allows bypassing the “Mark of the Web” making it easier to exeucte code by sending a malicious message to a user via e-mail or instant messaging. The victim will still have to open the file.

CVE-2026-108398

This vulnerability, a .NET framework security feature bypass, could be used to bypass application control and execute unauthorized applications. Details were available public head of today’s release, but Microsoft did not detect exploitation in the wild.

Windows DHCP Server

10 remote code execution vulenrabilities, including five critical vulnerabilities, affect the Windows DHCP server.

CVE-2026-70571 : Microsoft Exchange Server Remote Code Execution Vulnerability. Microsoft considers the attack complexity high. The vulnerability is triggered by an attacker sending a specific email to the exchange server that triggers the vulnerability during content conversion.

Aside from these specific vulnerabilities, the larger number of Office vulnerabilities is noteworthy, and the Office updates should likely be addressed quickly.