Argument Injection Vulnerability in MCP Server Kubernetes
CVE-2026-61459

9.3CRITICAL

Key Information:

Vendor

Flux159

Status
Mcp-server-kubernetes
Vendor
CVE Published:
10 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-61459?

The MCP Server Kubernetes is affected by an argument injection vulnerability that impacts structured tools such as kubectl_get, kubectl_describe, and kubectl_delete. This flaw allows malicious actors to bypass the security checks by using specially crafted resourceType and name parameters with leading dashes. By injecting the --server flag, attackers can redirect kubectl commands to their own server, facilitating unauthorized access to sensitive tokens and enabling a full compromise of the Kubernetes cluster.

Affected Version(s)

mcp-server-kubernetes 0 < 3.9.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-61459 - Proof of Concept

References

https://github.com/Flux159/mcp-server-kubernetes/releases...
release-notes
https://github.com/Flux159/mcp-server-kubernetes/issues/328
exploittechnical-description
https://github.com/Flux159/mcp-server-kubernetes/pull/329
issue-tracking

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

George Chen
.