CVE-2026-61459Public exploitNetwork attack vector

Cluster credential theft via positional flag injection

Published Jul 10, 2026 · Updated Jul 10, 2026

Argument injection in Flux159 MCP Server Kubernetes before 3.9.0 allows remote attackers to steal cluster credentials via structured tools. The kubectl_get, kubectl_describe, and kubectl_delete handlers append untrusted resourceType and name values to kubectl argv without checking for leading dashes. Control of an MCP tool argument, including through prompt-influenced model output, permits --server redirection and sends the operator's bearer token to an attacker-controlled API server.

CVSS severity9.3
Critical
EPSS probability2.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Argument injection in Flux159 MCP Server Kubernetes before 3.9.0 allows remote attackers to steal cluster credentials via structured tools. The kubectl_get, kubectl_describe, and kubectl_delete handlers append untrusted resourceType and name values to kubectl argv without checking for leading dashes. Control of an MCP tool argument, including through prompt-influenced model output, permits --server redirection and sends the operator's bearer token to an attacker-controlled API server.

The record

CVE
CVE-2026-61459
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
Flux159
Product
MCP Server Kubernetes
Classifications
CWE-88, T1528
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Flux159 · MCP Server Kubernetesversion=0 <3.9.0

Published CVSS scores

9.3GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
T1528Steal Application Access Token

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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