CVE-2026-88099CWE-248

CVE-2026-88099

Medium · published October 13, 2026

CVSS v3.1
5.9
EPSS
1%
Percentile
56.8
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00818 · 56.8th percentile
Weakness
CWE-248 · Uncaught Exception
Published
2026-10-13T23:21Z
Affected products (3)
ProductVersionsFixed in
microsoft/windows_server_2019< 10.0.17763.937610.0.17763.9376
microsoft/windows_server_2022< 10.0.20348.576110.0.20348.5761
microsoft/windows_server_2025< 10.0.26100.3365010.0.26100.33650
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88099 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:35Z
    EPSS moved — → 1%
    epss
  • 13 OCT 19:00Z
    Windows Failover Cluster Denial of Service Vulnerability
    cvelistv5
  • 13 OCT 19:00Z
    Windows Failover Cluster Denial of Service Vulnerability
    cvelistv5