CVE-2026-88099

MediumCVSS 5.9/10Last modified Oct 16, 2026

Description

Uncaught exception in Windows Failover Cluster allows an unauthorized attacker to deny service over a network.

Metrics

CVSS 3.1 5.9/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-248

Affected software

Vendor	Product	Versions
Microsoft	Windows Server 2019	>= 10.0.17763.0, < 10.0.17763.9376
Microsoft	Windows Server 2019 (Server Core installation)	>= 10.0.17763.0, < 10.0.17763.9376
Microsoft	Windows Server 2022	>= 10.0.20348.0, < 10.0.20348.5761
Microsoft	Windows Server 2025	>= 10.0.26100.0, < 10.0.26100.33650
Microsoft	Windows Server 2025 (Server Core installation)	>= 10.0.26100.0, < 10.0.26100.33650

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88099Patch, Vendor Advisory

Timeline

Published: Oct 13, 2026
Last modified: Oct 16, 2026
NVD status: Analyzed

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