CVE-2026-43000

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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 descubri\u00f3 un problema en OpenStack Keystone antes de la versi\u00f3n 29.0.2. Cuando se combina con una vulnerabilidad de suplantaci\u00f3n de credenciales de aplicaci\u00f3n, un atacante con el rol de miembro en un proyecto puede escalar a administrador encadenando credenciales de aplicaci\u00f3n sin restricciones con las confianzas de Keystone. El token suplantado lleva la identidad de la v\u00edctima, lo que pasa la verificaci\u00f3n de validaci\u00f3n del fideicomitente. Keystone luego valida los roles delegados contra las asignaciones de roles reales de la v\u00edctima 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 v\u00edctima a s\u00ed mismo. La confianza persiste de forma independiente, y se pueden crear confianzas y credenciales de aplicaci\u00f3n adicionales para mantener el acceso. Todas las acciones se registran bajo la identidad de la v\u00edctima."}], "id": "CVE-2026-43000", "lastModified": "2026-10-26T13:10:00.140", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.0, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.7, "source": "cve@mitre.org", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "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:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 6.0, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43000", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-28T19:41:32.071988Z", "version": "2.0.3"}}]}, "published": "2026-05-28T19:16:37.773", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://bugs.launchpad.net/keystone/+bug/2148477"}, {"source": "cve@mitre.org", "tags": ["Patch", "Vendor Advisory"], "url": "https://security.openstack.org/ossa/OSSA-2026-015.html"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-43000"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482826"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43000.json"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "cve@mitre.org", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-266"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "keystone: OpenStack Keystone: Privilege escalation via chained application credential impersonation and trust misuse", "id": "2482826", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482826"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L", "status": "draft"}, "cwe": "CWE-266", "details": ["A flaw was found in OpenStack Keystone. An attacker with a member role on a project can escalate their privileges to an administrator role. This is achieved by combining an application credential impersonation vulnerability with the misuse of Keystone trusts. The system incorrectly validates delegated roles against the victim's actual database roles instead of the requesting token, allowing the attacker to create a trust that grants them the victim's administrative privileges. This trust can then be used to maintain persistent access."], "name": "CVE-2026-43000", "public_date": "2026-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43000\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43000\nhttps://bugs.launchpad.net/keystone/+bug/2148477\nhttps://security.openstack.org/ossa/OSSA-2026-015.html"], "statement": "This IMPORTANT privilege escalation in Keystone allows project members to gain admin access by chaining application credential impersonation with trust exploitation. High complexity is required (multiple vulnerability chain). The scope is changed as the attacker gains persistent admin access affecting other users. Impact is high to confidentiality and integrity. Affects versions before 29.0.2.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[14.0.0,27.0.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[28.0.0,28.0.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[29.0.0,29.0.2)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Keystone", "source": "cna", "vendor": "OpenStack"}, "product": "keystone", "vendor": "openstack"}], "created": "2026-05-28T20:45:26.164891+00:00", "updated": "2026-06-04T14:00:15.364077+00:00", "vendors": ["openstack", "openstack$PRODUCT$keystone"]}