{"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"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96222"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-96222.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-96222"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2548802"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-96222"},{"url":"https://access.redhat.com/errata/RHSA-2026:86168"},{"url":"https://access.redhat.com/errata/RHSA-2026:86594"},{"url":"https://access.redhat.com/errata/RHSA-2026:86169"},{"url":"https://access.redhat.com/errata/RHSA-2026:84693"},{"url":"https://access.redhat.com/errata/RHSA-2026:88474"},{"url":"https://access.redhat.com/errata/RHSA-2026:88425"},{"url":"https://access.redhat.com/errata/RHSA-2026:88422"}],"tags":["nvd","ghsa","nuget","cve.org","csaf","vex","red-hat"],"aliases":["GHSA-vrv5-2jg9-4mmr"],"ecosystem":"nuget","ingestedAt":"2026-10-13T19:43:29.252Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-08T00:00:00+00:00"},"epss":0.00586,"epssPercentile":0.47839,"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\n\n## Vendor advisories\n\n- **RHSA-2026:86168** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86168)\n- **RHSA-2026:86594** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:86594)\n- **RHSA-2026:86169** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86169)\n- **RHSA-2026:84693** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84693)\n- **RHSA-2026:88474** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88474)\n- **RHSA-2026:88425** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88425)\n- **RHSA-2026:88422** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88422)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}