Use of Hard-coded Cryptographic Key Affecting arcade-mcp-server package, versions [,1.9.1)
Threat Intelligence
Exploit Maturity
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
Proof of Concept
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Test your applications- Snyk IDSNYK-PYTHON-ARCADEMCPSERVER-14171924
- published3 Dec 2025
- disclosed2 Dec 2025
- creditQi Deng
Introduced: 2 Dec 2025
NewCVE-2025-66454 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade arcade-mcp-server to version 1.9.1 or higher.
Overview
arcade-mcp-server is a Model Context Protocol (MCP) server framework for Arcade.dev
Affected versions of this package are vulnerable to Use of Hard-coded Cryptographic Key via the HTTP server uses a hardcoded default worker secret ("dev") that is never validated or overridden during normal server startup. An attacker can gain unauthorized access to all HTTP worker endpoints by forging valid JWTs using the known default secret.