CVE intelligence

CVE-2026-85818

Vulnerability intelligence

Published Oct 13, 2026Sources checked Oct 21, 2026

9.0CRITICALCVSS out of 10

What this means

Review the available evidence

CVE-2026-85818 and is rated Critical severity with a CVSS score of 9.0. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Oct 13, 2026

Vendor remediation details

Install KB5127648. Install KB5126655. Install KB5126646. Install KB5126653. Install KB5127646.

Vendor-listed releases

10.0.26300.9711
10.0.20348.5761
10.0.26100.33650
10.0.26200.9711
10.0.22631.7652
10.0.26100.9711
10.0.28000.3231

CISA KEVNot listedBased on the latest collected catalog

EPSS0.4%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-85818?

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

Source: NVD