Bug 2567958 (CVE-2026-88984)

Summary: CVE-2026-88984 github.com/kubeflow/pipelines: Kubeflow Pipelines: Unauthorized modification of shared pipelines via authorization bypass
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Kubeflow Pipelines. In multi-user deployments, the API server fails to properly enforce authorization checks on shared or global pipelines that use an empty namespace. An authenticated user can exploit this flaw to modify or delete shared pipeline definitions and versions without the required role-based access control (RBAC) permissions. This unauthorized access directly impacts the integrity and availability of shared machine learning workflows across the deployment.
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Description OSIDB Bzimport 2026-11-05 22:41:58 UTC 
Kubeflow Pipelines enables users to build and deploy portable, scalable machine learning workflows. Prior to 2.16.1, the multi-user API server treats the empty namespace used by shared or global pipelines as an authorization exception for modification and deletion operations. An authenticated user can modify or delete shared pipeline definitions and versions without the required Kubernetes RBAC permissions, compromising their integrity and availability. Read-only access to shared pipelines remains intentional, single-user deployments intentionally bypass multi-user checks, and execution of a modified pipeline is a conditional downstream consequence. The separate shared-pipeline multipart upload authorization path is outside this advisory and is not remediated by version 2.16.1. This issue is fixed in version 2.16.1.