{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-11T17:14:26.208","vulnerabilities":[{"cve":{"id":"CVE-2026-23990","sourceIdentifier":"security-advisories@github.com","published":"2026-01-21T23:15:52.930","lastModified":"2026-03-06T20:01:58.813","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"The Flux Operator is a Kubernetes CRD controller that manages the lifecycle of CNCF Flux CD and the ControlPlane enterprise distribution. Starting in version 0.36.0 and prior to version 0.40.0, a privilege escalation vulnerability exists in the Flux Operator Web UI authentication code that allows an attacker to bypass Kubernetes RBAC impersonation and execute API requests with the operator's service account privileges. In order to be vulnerable, cluster admins must configure the Flux Operator with an OIDC provider that issues tokens lacking the expected claims (e.g., `email`, `groups`), or configure custom CEL expressions that can evaluate to empty values. After OIDC token claims are processed through CEL expressions, there is no validation that the resulting `username` and `groups` values are non-empty. When both values are empty, the Kubernetes client-go library does not add impersonation headers to API requests, causing them to be executed with the flux-operator service account's credentials instead of the authenticated user's limited permissions. This can result in privilege escalation, data exposure, and/or information disclosure. Version 0.40.0 patches the issue."},{"lang":"es","value":"El Flux Operator es un controlador CRD de Kubernetes que gestiona el ciclo de vida de CNCF Flux CD y la distribución empresarial ControlPlane. A partir de la versión 0.36.0 y antes de la versión 0.40.0, existe una vulnerabilidad de escalada de privilegios en el código de autenticación de la interfaz de usuario web (Web UI) de Flux Operator que permite a un atacante eludir la suplantación de identidad de Kubernetes RBAC y ejecutar solicitudes de API con los privilegios de la cuenta de servicio del operador. Para ser vulnerable, los administradores del clúster deben configurar el Flux Operator con un proveedor OIDC que emita tokens que carezcan de las reclamaciones esperadas (por ejemplo, 'email', 'groups'), o configurar expresiones CEL personalizadas que puedan evaluarse como valores vacíos. Después de que las reclamaciones del token OIDC se procesen a través de expresiones CEL, no hay validación de que los valores resultantes de 'username' y 'groups' no estén vacíos. Cuando ambos valores están vacíos, la librería client-go de Kubernetes no añade encabezados de suplantación a las solicitudes de API, lo que hace que se ejecuten con las credenciales de la cuenta de servicio de flux-operator en lugar de los permisos limitados del usuario autenticado. Esto puede resultar en escalada de privilegios, exposición de datos y/o revelación de información. La versión 0.40.0 corrige el problema."}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":1.6,"impactScore":3.6}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Primary","description":[{"lang":"en","value":"CWE-269"},{"lang":"en","value":"CWE-862"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:control-plane:flux_operator:*:*:*:*:*:*:*:*","versionStartIncluding":"0.36.0","versionEndExcluding":"0.40.0","matchCriteriaId":"8E6653F2-6D30-4853-B2FD-9D474CBA289A"}]}]}],"references":[{"url":"https://github.com/controlplaneio-fluxcd/flux-operator/commit/084540424f6de8ba5d88fb1fd1e8472ba29afd7e","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/controlplaneio-fluxcd/flux-operator/pull/610","source":"security-advisories@github.com","tags":["Issue Tracking","Patch"]},{"url":"https://github.com/controlplaneio-fluxcd/flux-operator/releases/tag/v0.40.0","source":"security-advisories@github.com","tags":["Product","Release Notes"]},{"url":"https://github.com/controlplaneio-fluxcd/flux-operator/security/advisories/GHSA-4xh5-jcj2-ch8q","source":"security-advisories@github.com","tags":["Mitigation","Vendor Advisory"]}]}}]}