CVE-2026-11861
Full vulnerability record from the local CVENow database.
Description
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.
Severity
HIGH
CVSS score
8.1
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-08-20 11:16:19.270000
Last modified
2026-10-27 10:10:00.240000
View original CVE JSON
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"id": "CVE-2026-11861",
"sourceIdentifier": "[email protected]",
"published": "2026-08-20T11:16:19.270",
"lastModified": "2026-10-27T10:10:00.240",
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"value": "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."
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"value": "Se encontró un fallo en FreeIPA. Cuando se configura una relación de confianza entre FreeIPA y Active Directory, los usuarios de Active Directory pueden omitir la autenticación 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 Concesión de Tickets (TGS) debido a que los servicios de FreeIPA no verifican los certificados de Atributo de Privilegio (PAC). Esta vulnerabilidad podría permitir a un usuario autenticado de Active Directory escalar sus privilegios dentro del dominio de FreeIPA."
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