Flux159 mcp-server-kubernetes up to 3.6.x argument injection

Summaryinfo

A vulnerability was found in Flux159 mcp-server-kubernetes up to 3.6.x and classified as critical. Affected by this vulnerability is an unknown functionality. The manipulation results in argument injection. This vulnerability was named CVE-2026-47250. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Flux159 mcp-server-kubernetes up to 3.6.x. Affected is an unknown code. The manipulation with an unknown input leads to a argument injection vulnerability. CWE is classifying the issue as CWE-88. The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. This is going to have an impact on confidentiality. CVE summarizes:

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 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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-47250 since 05/19/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

Upgrading to version 3.7.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-36287). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Virtualization Software

Vendor

• Flux159

Name

• mcp-server-kubernetes

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6

Website

• Product: https://github.com/Flux159/mcp-server-kubernetes/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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