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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
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

argocd-mcp 0.8.0 版本将其 HTTP 传输绑定到所有网络接口，并且在配置了 的情况下，接受 MCP 会话时不要求调用方提供凭证。任何能够访问该监听器的攻击者，都可以利用操作者存储的令牌调用完整的工具集，从而创建应用、请求同步以及修改 Argo CD 资源。

CVSS 10.0 · Critical EPSS 0.37% · P30

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

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
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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 weakness: CWE-1327

V. Comments for CVE-2026-82456

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