CVE-2026-15416: Argo-cd: argo cd unauthenticated remote code execution in repo-server via generatemanifest grpc endpoint
A flaw was identified in Argo CD, the GitOps engine used by Red Hat OpenShift GitOps, that could allow an unauthenticated attacker with network access to the Argo CD repo-server to achieve remote code execution. Under certain conditions, the attacker may then manipulate cached data to deploy malicious Kubernetes resources to managed clusters, potentially resulting in complete cluster compromise.
Other sources
An unauthenticated attacker can exploit the Argo CD repo-server's GenerateManifest gRPC endpoint by supplying malicious KustomizeOptions (specifically BuildOptions or BinaryPath), causing arbitrary commands to be executed in the repo-server pod. When combined with Redis cache manipulation, this can result in the deployment of attacker-controlled Kubernetes manifests, potentially leading to complete compromise of the Kubernetes cluster.
— Red Hat