All vulnerabilities GHSA-4pvf-9j6w-8m88 testkube: unauthenticated Streamable HTTP MCP endpoint grants full control of Testkube workflows and execution data criticalCWE-306 Vendor kubeshop Package github.com/kubeshop/testkube go Affected <= dd574c0 Disclosed 2026-08-19 Credit Avishai Gonen auth-bypassmcpdocker Published advisory