{"id":"CVE-2026-88099","aliases":[],"title":"Windows Failover Cluster Denial of Service Vulnerability","titleSource":"microsoft","descriptionSource":"microsoft","products":[{"vendor":"Microsoft","name":"Windows Server 2019","platforms":["x64-based Systems"],"versions":[{"version":"10.0.17763.0","status":"affected","lessThan":"10.0.17763.9376","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-88099"},{"vendor":"Microsoft","name":"Windows Server 2019 (Server Core installation)","platforms":["x64-based Systems"],"versions":[{"version":"10.0.17763.0","status":"affected","lessThan":"10.0.17763.9376","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-88099"},{"vendor":"Microsoft","name":"Windows Server 2022","platforms":["x64-based Systems"],"versions":[{"version":"10.0.20348.0","status":"affected","lessThan":"10.0.20348.5761","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-88099"},{"vendor":"Microsoft","name":"Windows Server 2025","platforms":["x64-based Systems"],"versions":[{"version":"10.0.26100.0","status":"affected","lessThan":"10.0.26100.33650","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-88099"},{"vendor":"Microsoft","name":"Windows Server 2025 (Server Core installation)","platforms":["x64-based Systems"],"versions":[{"version":"10.0.26100.0","status":"affected","lessThan":"10.0.26100.33650","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-88099"}],"remediation":[],"description":"Uncaught exception in Windows Failover Cluster allows an unauthorized attacker to deny service over a network.","severity":"medium","score":5.9,"published":"2026-10-13T19:00:20.593Z","modified":"2026-10-28T18:14:42.988Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88099"],"sources":[{"name":"CVE","id":"CVE-2026-88099","modified":"2026-10-28T18:14:42.988Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-88099"}],"assessments":[{"source":"microsoft","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","score":5.9}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-29T03:10:35.950Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}