MicrosoftCVE-2026-78444
Microsoft Windows Failover Cluster: remote code execution
High8.1CVE-2026-78444 · Published Sep 8, 2026 · updated Sep 11, 2026
Untrusted pointer dereference in Windows Failover Cluster allows an unauthorized attacker to execute code over a network.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Windows 10 Version 1809 Product | >= 10.0.17763.0, < 10.0.17763.9245 | 10.0.17763.9245 |
| Windows Server 2019 Product | >= 10.0.17763.0, < 10.0.17763.9245 | 10.0.17763.9245 |
| Windows Server 2019 (Server Core installation) Product | >= 10.0.17763.0, < 10.0.17763.9245 | 10.0.17763.9245 |
| Windows Server 2022 Product | >= 10.0.20348.0, < 10.0.20348.5622 | 10.0.20348.5622 |
| Windows Server 2025 Product | >= 10.0.26100.0, < 10.0.26100.33438 | 10.0.26100.33438 |
| Windows Server 2025 (Server Core installation) Product | >= 10.0.26100.0, < 10.0.26100.33438 | 10.0.26100.33438 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-822
More Microsoft advisories
All Microsoft| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Sep 8 | Microsoft Skype for Business: spoofing | High8.3 | 6.0.9319.885+2 more |
| Sep 8 | Microsoft Skype for Business: cross-site scripting | Medium6.5 | 6.0.9319.885+2 more |
| Sep 8 | Microsoft Skype for Business: spoofing | High7.1 | 6.0.9319.885+2 more |
| Sep 8 | Microsoft Skype for Business: information disclosure | Medium6.5 | 6.0.9319.885+2 more |
| Sep 8 | Microsoft Skype for Business: integer overflow | High7.5 | 6.0.9319.885+2 more |
| Sep 8 | Microsoft Skype for Business: out-of-bounds read | Medium6.5 | 6.0.9319.885+2 more |