CVE-2026-43000

Full vulnerability record from the local CVENow database.
Description

An issue was discovered in OpenStack Keystone before 29.0.2. When combined with an application credential impersonation vulnerability, an attacker with the member role on a project can escalate to admin by chaining unrestricted application credentials with Keystone trusts. The impersonated token carries the victim's identity, which passes the trustor validation check. Keystone then validates the delegated roles against the victim's actual role assignments in the database, not the roles on the requesting token. This allows the attacker to create a trust delegating the victim's admin role to themselves. The trust persists independently, and additional trusts and application credentials can be created to maintain access. All actions are logged under the victim's identity.
Severity
HIGH
CVSS score
8.8 (v3.1)
Vulnerability status
Modified
Source identifier
[email protected]
Published
2026-05-28 19:16:37.773000
Last modified
2026-10-26 13:10:00.140000
View original CVE JSON
{
  "id": "CVE-2026-43000",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-28T19:16:37.773",
  "lastModified": "2026-10-26T13:10:00.140",
  "vulnStatus": "Modified",
  "cveTags": [],
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      "value": "An issue was discovered in OpenStack Keystone before 29.0.2. When combined with an application credential impersonation vulnerability, an attacker with the member role on a project can escalate to admin by chaining unrestricted application credentials with Keystone trusts. The impersonated token carries the victim's identity, which passes the trustor validation check. Keystone then validates the delegated roles against the victim's actual role assignments in the database, not the roles on the requesting token. This allows the attacker to create a trust delegating the victim's admin role to themselves. The trust persists independently, and additional trusts and application credentials can be created to maintain access. All actions are logged under the victim's identity."
    },
    {
      "lang": "es",
      "value": "Se descubrió un problema en OpenStack Keystone antes de la versión 29.0.2. Cuando se combina con una vulnerabilidad de suplantación de credenciales de aplicación, un atacante con el rol de miembro en un proyecto puede escalar a administrador encadenando credenciales de aplicación sin restricciones con las confianzas de Keystone. El token suplantado lleva la identidad de la víctima, lo que pasa la verificación de validación del fideicomitente. Keystone luego valida los roles delegados contra las asignaciones de roles reales de la víctima en la base de datos, no los roles en el token solicitante. Esto permite al atacante crear una confianza delegando el rol de administrador de la víctima a sí mismo. La confianza persiste de forma independiente, y se pueden crear confianzas y credenciales de aplicación adicionales para mantener el acceso. Todas las acciones se registran bajo la identidad de la víctima."
    }
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