critical9.0
CVE-2026-85818
Improper verification of cryptographic signature in Windows Schannel allows an unauthorized attacker to perform spoofing over a network.
Impact
Improper verification of cryptographic signature in Windows Schannel allows an unauthorized attacker to perform spoofing over a network.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Windows Server 2025 | from 10.0.26100.0 before 10.0.26100.33650 |
| Microsoft | Windows 11 Version 26H1 | from 10.0.28000.0 before 10.0.28000.3231 |
| Microsoft | Windows 11 Version 24H2 | from 10.0.26100.0 before 10.0.26100.9711 |
| Microsoft | Windows Server 2025 (Server Core Installation) | from 10.0.26100.0 before 10.0.26100.33650 |
| Microsoft | Windows Server 2022 | from 10.0.20348.0 before 10.0.20348.5761 |
| Microsoft | Windows 11 Version 25H2 | from 10.0.26200.0 before 10.0.26200.9711 |
| Microsoft | Windows 11 Version 26H2 | from 10.0.26300.0 before 10.0.26300.9711 |
| Microsoft | Windows 11 Version 23H2 | from 10.0.22631.0 before 10.0.22631.7652 |
| Microsoft | Windows 11 23h2 | before 10.0.22631.7652 |
| Microsoft | Windows 11 24h2 | before 10.0.26100.9711 |
| Microsoft | Windows 11 25h2 | before 10.0.26200.9711 |
| Microsoft | Windows 11 26h1 | before 10.0.28000.3231 |
| Microsoft | Windows 11 26h2 | before 10.0.26300.9711 |
| Microsoft | Windows Server 2022 | before 10.0.20348.5761 |
| Microsoft | Windows Server 2025 | before 10.0.26100.33650 |