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Vulnerability details

CVE-2026-88102

Microsoft Windows Server

Microsoft Failover Cluster Remote Code Execution Vulnerability

CVSS 3.1
9.8Critical

Official description

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

CVSS scores

ScoreVersionSourceVector
9.8Critical 3.1 CVEProject cvelistV5 (CNA) (microsoft) CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Affected products

VendorProductVersionsSource
Microsoft Windows Server 2019 10.0.17763.0 ≤ v < 10.0.17763.9376 CVEProject cvelistV5 (CNA)
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 ≤ v < 10.0.17763.9376 CVEProject cvelistV5 (CNA)
Microsoft Windows Server 2022 10.0.20348.0 ≤ v < 10.0.20348.5761 CVEProject cvelistV5 (CNA)
Microsoft Windows Server 2025 10.0.26100.0 ≤ v < 10.0.26100.33650 CVEProject cvelistV5 (CNA)
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 ≤ v < 10.0.26100.33650 CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-10-13
Last updated
2026-10-31
State
Published
Assigner (CNA)
microsoft
Kolun priority
37 · Medium

Exploit prediction (EPSS)

0.63%
Probability of exploitation in 30 days
50.6%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
Yes
Exploitation
None
Technical impact
Total

Weaknesses (CWE)

  • CWE-416
    Use After Free