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PyPI package

arcade-mcp-server

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1 actionable advisory, newest first. Withdrawn advisories and news are excluded. Coverage is partial.

  1. Medium, CVSS 6.5PyPIAmendedPublished

    arcade-mcp-server Has Default Hardcoded Worker Secret That Allows Full Unauthorized Access to All HTTP MCP Worker Endpoints

    CVE-2025-66454 · GHSA-g2jx-37x6-6438

    Affected
    • PyPI arcade-mcp-server < 1.9.1
    Fixed in
    1.9.1· Vendor fix available
    Issue
    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. Anyone following the official quick-start guide is vulnerable unless they manually override ARCADEWORKERSECRET. Details The documented method for launching an HTTP MCP server (python server.py http) implicitly sets the worker secret to the hardcoded default "dev": ArcadeSettings.serversecret defaults to "dev" (libs/arcade-mcp-server/arcademcpserver/settings.py:129–158) createarcademcp() passes this value directly to FastAPIWorker without validation (libs/arcade-mcp-server/arcademcpserver/worker.py:118–188) BaseWorker.setsecret() accepts this value and does not enforce rotation…

    Recommended action: Upgrade to 1.9.1 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.

    Sources:osv.dev (1)github.com (2)Source checked Evidence →