---
id: CVE-2026-82456
title: >-
  argocd-mcp 0.8.0 binds its HTTP transport to every network interface and
  accepts MCP sessions without requiring caller credentials when
  ARGOCD_API_TOKEN is configured
summary: >-
  argocd-mcp 0.8.0 binds its HTTP transport to every network interface and
  accepts MCP sessions without requiring caller credentials when
  ARGOCD_API_TOKEN is configured. Attackers who can reach the listener can
  invoke the full tool surface…
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-1327
published: '2026-08-29'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:17:46.233'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82456'
references:
  - url: 'https://github.com/argoproj-labs/mcp-for-argocd'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/argoproj-labs/mcp-for-argocd/security/advisories/GHSA-rp45-5x3v-48mr
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/argocd-mcp-0.8.0-authentication-bypass-via-unauthenticated-http
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/argoproj-labs/mcp-for-argocd/security/advisories/GHSA-rp45-5x3v-48mr
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - exploit-available
  - cve.org
epss: 0.01729
epssPercentile: 0.76607
exploits:
  nuclei:
    - CVE-2026-82456
  checkedAt: '2026-09-26T09:06:02.092Z'
exploitAvailable: true
ingestedAt: '2026-08-30T07:49:08.726Z'
vendor: argoproj-labs
product: argocd-mcp
affected:
  - argocd-mcp >= 0.8.0 < 0.9.0
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-02T17:59:54.136197Z'
---

## Overview

argocd-mcp 0.8.0 binds its HTTP transport to every network interface and accepts MCP sessions without requiring caller credentials when ARGOCD_API_TOKEN is configured. Attackers who can reach the listener can invoke the full tool surface using the operator's stored token to create applications, request syncs, and modify Argo CD resources.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.