{"id":"CVE-2026-88099","title":"Uncaught exception in Windows Failover Cluster allows an unauthorized attacker to deny service over a network.","summary":"Uncaught exception in Windows Failover Cluster allows an unauthorized attacker to deny service over a network.","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-248"],"vendor":"microsoft","product":"windows_server_2019","affected":["windows_server_2019 < 10.0.17763.9376","windows_server_2022 < 10.0.20348.5761","windows_server_2025 < 10.0.26100.33650"],"patched":["windows_server_2019 10.0.17763.9376","windows_server_2022 10.0.20348.5761","windows_server_2025 10.0.26100.33650"],"published":"2026-10-13","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:43:48.160","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-88099","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88099","label":"secure@microsoft.com"}],"tags":["nvd","cve.org"],"epss":0.00818,"epssPercentile":0.56968,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-13T19:58:10.343167Z"},"ingestedAt":"2026-10-13T19:43:29.211Z","slug":"CVE-2026-88099","body":"## Overview\n\nUncaught exception in Windows Failover Cluster allows an unauthorized attacker to deny service over a network.\n\n## Affected\n\n- `windows_server_2019 < 10.0.17763.9376`\n- `windows_server_2022 < 10.0.20348.5761`\n- `windows_server_2025 < 10.0.26100.33650`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `windows_server_2019 10.0.17763.9376`\n- `windows_server_2022 10.0.20348.5761`\n- `windows_server_2025 10.0.26100.33650`","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}