CVE-2026-85818: critical vulnerability in Microsoft Windows 11 version 23H2
Windows Schannel Spoofing Vulnerability
Published · Updated
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9epss 0.4%
exploitation probability
0.4%top 65% of all CVEs
observed exploitation
nono source reports it
Improper verification of cryptographic signature in Windows Schannel allows an unauthorized attacker to perform spoofing over a network.
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
Microsoft · Windows 11 version 23H2Microsoft · Windows 11 Version 24H2Microsoft · Windows 11 Version 25H2Microsoft · Windows 11 version 26H1Microsoft · Windows 11 Version 26H2Microsoft · Windows Server 2022Microsoft · Windows Server 2025Microsoft · Windows Server 2025 (Server Core installation)Related CVEs — Microsoft Windows 11 version 23H2
In the same product, most dangerous first.
CVE-2025-33053HIGHInternet Shortcut Files Remote Code Execution VulnerabilityEPSS 87.0%KEVCVE-2024-43451MEDIUMNTLM Hash Disclosure Spoofing VulnerabilityEPSS 85.4%KEVCVE-2025-33073HIGHWindows SMB Client Elevation of Privilege VulnerabilityEPSS 82.7%KEVCVE-2024-30088HIGHWindows Kernel Elevation of Privilege VulnerabilityEPSS 68.2%KEVCVE-2024-43572HIGHMicrosoft Management Console Remote Code Execution VulnerabilityEPSS 66.7%KEVCVE-2025-24054MEDIUMNTLM Hash Disclosure Spoofing VulnerabilityEPSS 62.3%KEV