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CVE-2025-66454— Arcade MCP Default Hardcoded Worker Secret Allows Full Unauthorized Access to All HTTP MCP Worker Endpoints

Quick assessment

Affected
ArcadeAI arcade-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.

Arcade MCP Server Framework是Arcade.dev开源的一个MCP服务器框架。 Arcade MCP Server Framework 1.5.4之前版本存在信任管理问题漏洞，该漏洞源于硬编码默认工作密钥，可能导致绕过身份验证层。

CVSS 6.5 · Medium EPSS 0.31% · P24
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I. Basic Information for CVE-2025-66454

Vulnerability Information
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Vulnerability Title
Arcade MCP Default Hardcoded Worker Secret Allows Full Unauthorized Access to All HTTP MCP Worker Endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
Arcade MCP allows you to to create, deploy, and share MCP Servers. Prior to 1.5.4, the arcade-mcp HTTP server uses a hardcoded default worker secret ("dev") that is never validated or overridden during normal server startup. As a result, any unauthenticated attacker who knows this default key can forge valid JWTs and fully bypass the FastAPI authentication layer. This grants remote access to all worker endpoints—including tool enumeration and tool invocation—without credentials. This vulnerability is fixed in 1.5.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用硬编码的密码学密钥
Source: CVE Program / CVE List V5
Vulnerability Title
Arcade MCP Server Framework 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Arcade MCP Server Framework是Arcade.dev开源的一个MCP服务器框架。 Arcade MCP Server Framework 1.5.4之前版本存在信任管理问题漏洞，该漏洞源于硬编码默认工作密钥，可能导致绕过身份验证层。
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
ArcadeAI arcade-mcp < 1.5.4 -

II. Public POCs for CVE-2025-66454

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III. Intelligence Information for CVE-2025-66454

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IV. Related Vulnerabilities

Same weakness: CWE-321

V. Comments for CVE-2025-66454

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