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CVE-2026-82456— argocd-mcp 0.8.0 Authentication Bypass via Unauthenticated HTTP

Quick assessment

Affected
argoproj-labs argocd-mcp
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

argoproj-labs Argo CD MCP Server是argoproj-labs组织开源的一个集成持续交付工具链的模型上下文协议服务器。 argoproj-labs Argo CD MCP Server 0.8.0版本存在配置错误漏洞，该漏洞源于HTTP传输绑定到所有网络接口，在配置ARGOCD_API_TOKEN时未要求调用者凭据即接受MCP会话，攻击者可能使用操作者存储的令牌调用完整工具表面，创建应用程序、请求同步并修改Argo CD资源。

CVSS 10.0 · Critical EPSS 1.73% · P77

Public Exploits 1

Nuclei · 1 CVE-2026-82456.yaml [template]

Affected Version Matrix 1

VendorProduct Version RangeStatus
argoproj-labs argocd-mcp 0.8.0< 0.9.0 affected
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I. Basic Information for CVE-2026-82456

Vulnerability Information
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Vulnerability Title
argocd-mcp 0.8.0 Authentication Bypass via Unauthenticated HTTP
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1327
Source: CVE Program / CVE List V5
Vulnerability Title
argoproj-labs Argo CD MCP Server 配置错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
argoproj-labs Argo CD MCP Server是argoproj-labs组织开源的一个集成持续交付工具链的模型上下文协议服务器。 argoproj-labs Argo CD MCP Server 0.8.0版本存在配置错误漏洞，该漏洞源于HTTP传输绑定到所有网络接口，在配置ARGOCD_API_TOKEN时未要求调用者凭据即接受MCP会话，攻击者可能使用操作者存储的令牌调用完整工具表面，创建应用程序、请求同步并修改Argo CD资源。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
argoproj-labs argocd-mcp 0.8.0 ~ 0.9.0 -

II. Public POCs for CVE-2026-82456

# POC Description Source Link Shenlong Link
1 argocd-mcp before 0.9.0 binds its MCP HTTP listener to all interfaces without requiring authentication. A remote unauthenticated attacker can initialize an MCP session, complete the handshake, and enumerate or invoke the full Argo CD tool surface using the operator's stored API token. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-82456.yaml POC Details
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III. Intelligence Information for CVE-2026-82456

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Vendor Advisories for CVE-2026-82456 (2)

Proof of Concept for CVE-2026-82456 (1)

IV. Related Vulnerabilities

Same product: argocd-mcp
Same vendor: argoproj-labs
Same weakness: CWE-1327

V. Comments for CVE-2026-82456

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