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Vulnerability details

CVE-2026-85818

Microsoft Windows 11Microsoft Windows Server

Windows Schannel Spoofing Vulnerability

CVSS 3.1
9.0Critical

Official description

Improper verification of cryptographic signature in Windows Schannel allows an unauthorized attacker to perform spoofing over a network.

CVSS scores

ScoreVersionSourceVector
9.0Critical 3.1 CVEProject cvelistV5 (CNA) (microsoft) CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

Affected products

VendorProductVersionsSource
Microsoft Windows 11 Version 24H2 10.0.26100.0 ≤ v < 10.0.26100.9711 CVEProject cvelistV5 (CNA)
Microsoft Windows 11 Version 25H2 10.0.26200.0 ≤ v < 10.0.26200.9711 CVEProject cvelistV5 (CNA)
Microsoft Windows 11 Version 26H2 10.0.26300.0 ≤ v < 10.0.26300.9711 CVEProject cvelistV5 (CNA)
Microsoft Windows 11 version 23H2 10.0.22631.0 ≤ v < 10.0.22631.7652 CVEProject cvelistV5 (CNA)
Microsoft Windows 11 version 23H2 10.0.22631.0 ≤ v < 10.0.22631.7652 CVEProject cvelistV5 (CNA)
Microsoft Windows 11 version 26H1 10.0.28000.0 ≤ v < 10.0.28000.3231 CVEProject cvelistV5 (CNA)
Microsoft Windows Server 2022 10.0.20348.0 ≤ v < 10.0.20348.5761 CVEProject cvelistV5 (CNA)
Microsoft Windows Server 2025 10.0.26100.0 ≤ v < 10.0.26100.33650 CVEProject cvelistV5 (CNA)
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 ≤ v < 10.0.26100.33650 CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-10-13
Last updated
2026-11-11
State
Published
Assigner (CNA)
microsoft
Kolun priority
33 · Low

Exploit prediction (EPSS)

0.41%
Probability of exploitation in 30 days
36%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Total

Weaknesses (CWE)

  • CWE-347
    Improper Verification of Cryptographic Signature