{"id":"CVE-2026-96222","title":"Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.","summary":"Improper certificate validation 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-295"],"vendor":"System","product":"System.Security.Cryptography.Xml","affected":["System.Security.Cryptography.Xml >= 8.0.0, <= 8.0.4"],"patched":["System.Security.Cryptography.Xml 8.0.5"],"published":"2026-10-13","updated":"2026-10-14","sourceUpdated":"2026-10-14T04:18:57.730","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-96222","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96222","label":"secure@microsoft.com"},{"url":"https://github.com/dotnet/runtime/security/advisories/GHSA-vrv5-2jg9-4mmr"},{"url":"https://github.com/dotnet/announcements/issues/474"},{"url":"https://github.com/dotnet/runtime/issues/135705"},{"url":"https://github.com/advisories/GHSA-vrv5-2jg9-4mmr"}],"tags":["nvd","ghsa","nuget"],"aliases":["GHSA-vrv5-2jg9-4mmr"],"ecosystem":"nuget","ingestedAt":"2026-10-13T19:43:29.252Z","slug":"CVE-2026-96222","body":"## Overview\n\nImproper certificate validation 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.\n\n## Package advisory (CVE-2026-96222)\n\nAffected packages:\n\n- `System.Security.Cryptography.Xml >= 8.0.0, <= 8.0.4`\n\nPatched in:\n\n- `System.Security.Cryptography.Xml 8.0.5`\n\nSource: https://github.com/advisories/GHSA-vrv5-2jg9-4mmr","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}