CVE-2026-11861

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When a trust relationship is configured between FreeIPA and Active Directory, Active Directory users can bypass authentication for FreeIPA services, including the portal, SMB server, and LDAP directory. This is possible by impersonating a client name in the Ticket Granting Service (TGS) due to FreeIPA services not verifying Privilege Attribute Certificate (PAC) certificates. This vulnerability could allow an authenticated Active Directory user to escalate their privileges within the FreeIPA domain."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "ipa", "defaultStatus": "affected", "versions": [{"version": "0:4.13.4-1.el10_2", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/o:redhat:enterprise_linux:10.2"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10.0 Extended Update Support", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "ipa", "defaultStatus": "affected", "versions": [{"version": "0:4.12.2-15.el10_0.7", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/o:redhat:enterprise_linux_eus:10.0"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7 Extended Lifecycle Support", "collectionURL": 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When a trust relationship is configured between FreeIPA and Active Directory, Active Directory users can bypass authentication for FreeIPA services, including the portal, SMB server, and LDAP directory. This is possible by impersonating a client name in the Ticket Granting Service (TGS) due to FreeIPA services not verifying Privilege Attribute Certificate (PAC) certificates. This vulnerability could allow an authenticated Active Directory user to escalate their privileges within the FreeIPA domain."}, {"lang": "es", "value": "Se encontr\u00f3 un fallo en FreeIPA. Cuando se configura una relaci\u00f3n de confianza entre FreeIPA y Active Directory, los usuarios de Active Directory pueden omitir la autenticaci\u00f3n para los servicios de FreeIPA, incluyendo el portal, el servidor SMB y el directorio LDAP. Esto es posible suplantando un nombre de cliente en el Servicio de Concesi\u00f3n de Tickets (TGS) debido a que los servicios de FreeIPA no verifican los certificados de Atributo de Privilegio (PAC). Esta vulnerabilidad podr\u00eda permitir a un usuario autenticado de Active Directory escalar sus privilegios dentro del dominio de FreeIPA."}], "id": "CVE-2026-11861", "lastModified": "2026-11-05T17:17:58.833", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.6, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 5.8, "source": "secalert@redhat.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-11861", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-20T13:48:14.824853Z", "version": "2.0.3"}}]}, "published": "2026-08-20T11:16:19.270", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:70564"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:72279"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:82935"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:83083"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:83084"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:83085"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:83460"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:83461"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:89836"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:93071"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:93452"}, {"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-11861"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2487472"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-266"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Vladislav Plyatsok (rd01f) for reporting this issue.", "bugzilla": {"description": "FreeIPA: idm: ipa: FreeIPA: Obtaining TGS with impersonating cname through trust relationships", "id": "2487472", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2487472"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.6", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-266", "details": ["A flaw was found in FreeIPA. When a trust relationship is configured between FreeIPA and Active Directory, Active Directory users can bypass authentication for FreeIPA services, including the portal, SMB server, and LDAP directory. This is possible by impersonating a client name in the Ticket Granting Service (TGS) due to FreeIPA services not verifying Privilege Attribute Certificate (PAC) certificates. This vulnerability could allow an authenticated Active Directory user to escalate their privileges within the FreeIPA domain."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-11861", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "ipa", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "ipa", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "ipa", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "ipa", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "ipa", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-20T08:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-11861\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-11861"], "statement": "This vulnerability is rated as Moderate because practical exploitation is significantly constrained by conditions that are unlikely to be met in most production environments. The attack requires a cross-realm trust to be configured between FreeIPA and Active Directory, the attacker must already hold a valid Active Directory account, and the impersonation technique depends on the ability to register a duplicate or conflicting Service Principal Name (SPN) in the Active Directory forest. Microsoft addressed this prerequisite by enforcing SPN and UPN uniqueness constraints on Windows Server 2012 R2 domain controllers with MSKB-3070083 applied, and by default on Windows 11 version 22H2 and later. In environments where the Active Directory domain controllers are patched and running a supported functional level, the attack path is blocked on the Windows side. Only deployments trusting an outdated or unpatched Active Directory environment remain realistically at risk, making this primarily a theoretical concern in modern, maintained environments.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Red Hat Enterprise Linux 10", "source": "cna", "vendor": "Red Hat"}, "product": "enterprise_linux", "vendor": "redhat"}], "created": "2026-08-20T22:45:02.962902+00:00", "updated": "2026-08-21T21:15:48.874587+00:00", "vendors": ["redhat", "redhat$PRODUCT$enterprise_linux"]}