CVE-2026-78444

Published: Sep 8, 2026Modified: Sep 11, 2026

8.1

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitability: 2.2 / Impact: 5.9

Source: secure@microsoft.com (Secondary)

Description

Untrusted pointer dereference in Windows Failover Cluster allows an unauthorized attacker to execute code over a network.

Affected (5)

Products: Microsoft: Windows 10 1809, Windows Server 2019, Windows Server 2022, Windows Server 2025

4 products

Windows 10 1809

Windows Server 2019

Windows Server 2022

Windows Server 2025

Configuration A

5 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 1809	version < 10.0.17763.9245
Microsoft Windows 10 1809	version < 10.0.17763.9245
Microsoft Windows Server 2019	version < 10.0.17763.9245
Microsoft Windows Server 2022	version < 10.0.20348.5622
Microsoft Windows Server 2025	version < 10.0.26100.33438

Related CWEs

Untrusted Pointer Dereference

The product obtains a value from an untrusted source, converts this value to a pointer, and dereferences the resulting pointer.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78444

Source: secure@microsoft.com

PatchVendor Advisory

Timeline

No history available yet.