by Kastro
Paper/Archive/CVE-2026-88102

CVE-2026-88102

Microsoft Windows Server 2019 — Microsoft Failover Cluster Remote Code Execution Vulnerability

EPSS 0.6%CVSS 9.8
critical.is priorityof 100
40
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 50.3.503 × 2010.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Use after free in Windows Failover Cluster allows an unauthorized attacker to execute code over a network.

Affected

ProductAffectedFixed inSource
Windows Server 201910.0.17763.0 – < 10.0.17763.937610.0.17763.9376CNA
Windows Server 2019 (Server Core installation)10.0.17763.0 – < 10.0.17763.937610.0.17763.9376CNA
Windows Server 202210.0.20348.0 – < 10.0.20348.576110.0.20348.5761CNA
Windows Server 202510.0.26100.0 – < 10.0.26100.3365010.0.26100.33650CNA
Windows Server 2025 (Server Core installation)10.0.26100.0 – < 10.0.26100.3365010.0.26100.33650CNA

Scores by source

microsoft (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

patchmsrc.microsoft.com/update-guide/vulnerability/CVE-2026-88102