CVE-2026-85818 Windows Schannel - Spoofing

Windows Schannel contains a cryptographic signature verification flaw, letting unauthorized attackers perform network spoofing, exploit requires network access.

CVSS base score 9.0 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.42% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Spoofing
Impact
Man In The Middle
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
13 October 2026
Updated
15 October 2026
Weakness
CWE-347

Vendor fix

Update to the latest version with security patches.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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