Vulnerability in Microsoft Windows 11 version 23H2

[ Why it matters ]Priority signals

• Critical severity: CVSS 9.0

[ Description ]Official description

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

[ Fixes ]Fixes and patches

• Patch on msrc.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ Advisories ]Government CERT advisories

• CERT-FR14 Oct 2026CERTFR-2026-AVI-1314

  Multiple vulnerabilities in Microsoft Windows Translated from French

  Multiple vulnerabilities have been discovered in Microsoft Windows. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service. Microsoft reports that…

  CVE-2026-70096CVE-2026-100200CVE-2026-100201+1118 more CVEs
• BSI CERT-Bund13 Oct 2026WID-SEC-2026-3892

  Microsoft Windows and Windows Server: Multiple vulnerabilities Translated from German

  CVE-2026-69968CVE-2026-83785CVE-2026-72968+1124 more CVEs
• NCSC-NL13 Oct 2026NCSC-2026-0423

  Vulnerabilities fixed in Microsoft Windows Translated from Dutch

  Probability/damage M/HCVE-2026-100202CVE-2026-100219CVE-2026-100222+49 more CVEs

[ References ]References

• msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85818Vendor AdvisoryPatch