Oct 2026: Windows Schannel Spoofing Vulnerability
CVE-2026-105008 Published on October 13, 2026

Windows Schannel Spoofing Vulnerability
No cwe for this issue in Windows Schannel allows an unauthorized attacker to perform spoofing over a network.

Vendor Advisory NVD

Vulnerability Analysis

Exploitation:

NONE

Automatable:

Technical Impact:

TOTAL

Weakness Types

Unprotected Alternate Channel

The software protects a primary channel, but it does not use the same level of protection for an alternate channel.

Authentication Bypass by Spoofing

This attack-focused weakness is caused by improperly implemented authentication schemes that are subject to spoofing attacks.

Products Associated with CVE-2026-105008

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Microsoft Windows Server 2012

Microsoft Windows Server 2012 R2

Microsoft Windows 10

Microsoft Windows Server 2016

Microsoft Windows Server 2019

Microsoft Windows Server 2022

Microsoft Windows 11 23h2

Microsoft Windows 11 24h2

Microsoft Windows 11 25h2

Microsoft Windows 11 Version 26h2 Arm64 Based Systems

Microsoft Windows Server 2025

Microsoft Windows 11 26h1

Affected Versions

Microsoft Windows 10 Version 1607:

Version 10.0.14393.0 and below 10.0.14393.9612 is affected.

Microsoft Windows 10 Version 1809:

Version 10.0.17763.0 and below 10.0.17763.9376 is affected.

Microsoft Windows 10 Version 21H2:

Version 10.0.19044.0 and below 10.0.19044.7807 is affected.

Microsoft Windows 10 Version 22H2:

Version 10.0.19045.0 and below 10.0.19045.7807 is affected.

Microsoft Windows 11 version 23H2:

Version 10.0.22631.0 and below 10.0.22631.7652 is affected.

Microsoft Windows 11 Version 23H2:

Version 10.0.22631.0 and below 10.0.22631.7652 is affected.

Microsoft Windows 11 Version 24H2:

Version 10.0.26100.0 and below 10.0.26100.9711 is affected.

Microsoft Windows 11 Version 25H2:

Version 10.0.26200.0 and below 10.0.26200.9711 is affected.

Microsoft Windows 11 version 26H1:

Version 10.0.28000.0 and below 10.0.28000.3231 is affected.

Microsoft Windows 11 Version 26H2:

Version 10.0.26300.0 and below 10.0.26300.9711 is affected.

Microsoft Windows Server 2012:

Version 6.2.9200.0 and below 6.2.9200.26434 is affected.

Microsoft Windows Server 2012 (Server Core installation):

Version 6.2.9200.0 and below 6.2.9200.26434 is affected.

Microsoft Windows Server 2012 R2:

Version 6.3.9600.0 and below 6.3.9600.23470 is affected.

Microsoft Windows Server 2012 R2 (Server Core installation):

Version 6.3.9600.0 and below 6.3.9600.23470 is affected.

Microsoft Windows Server 2016:

Version 10.0.14393.0 and below 10.0.14393.9612 is affected.

Microsoft Windows Server 2016 (Server Core installation):

Version 10.0.14393.0 and below 10.0.14393.9612 is affected.

Microsoft Windows Server 2019:

Version 10.0.17763.0 and below 10.0.17763.9376 is affected.

Microsoft Windows Server 2019 (Server Core installation):

Version 10.0.17763.0 and below 10.0.17763.9376 is affected.

Microsoft Windows Server 2022:

Version 10.0.20348.0 and below 10.0.20348.5761 is affected.

Microsoft Windows Server 2025:

Version 10.0.26100.0 and below 10.0.26100.33650 is affected.

Microsoft Windows Server 2025 (Server Core installation):

Version 10.0.26100.0 and below 10.0.26100.33650 is affected.

Exploit Probability

EPSS

0.66%

Percentile

52.31%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.

Oct 2026: Windows Schannel Spoofing VulnerabilityCVE-2026-105008 Published on October 13, 2026