MCP Server Kubernetes before 3.9.0 contains an argument injection vulnerability in structured tools (kubectl get, kubectl describe, kubectl delete) that allows attackers to bypass the assertNoDangerousFlags security check by supplying resourceType and name parameters with leading dashes. Attackers can inject the --server flag to redirect kubectl commands to an attacker-controlled API server, causing the operator's bearer token to be transmitted externally and enabling full cluster compromise.