{"id":"CVE-2026-83511","title":"Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.","summary":"Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-1390"],"published":"2026-10-13","updated":"2026-10-14","sourceUpdated":"2026-10-14T04:18:37.280","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-83511","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83511","label":"secure@microsoft.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-13T19:43:29.061Z","vendor":"Microsoft","product":"Windows 10 Version 1607","affected":["windows_10_version_1607 >= 10.0.14393.0 < 10.0.14393.9612","windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.9376","windows_server_2012_r2 >= 6.3.9600.0 < 6.3.9600.23470","windows_server_2012_r2_server_core_installation >= 6.3.9600.0 < 6.3.9600.23470","windows_server_2016 >= 10.0.14393.0 < 10.0.14393.9612","windows_server_2016_server_core_installation >= 10.0.14393.0 < 10.0.14393.9612","windows_server_2019 >= 10.0.17763.0 < 10.0.17763.9376","windows_server_2019_server_core_installation >= 10.0.17763.0 < 10.0.17763.9376","windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5761","windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33650","windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.33650"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-08T00:00:00+00:00"},"epss":0.00666,"epssPercentile":0.51633,"slug":"CVE-2026-83511","body":"## Overview\n\nWeak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}