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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.

PUBLISHED Reserved 2025-12-01 | Published 2025-12-02 | Updated 2025-12-02 | Assigner GitHub_M




MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Problem types

CWE-321: Use of Hard-coded Cryptographic Key

CWE-798: Use of Hard-coded Credentials

Product status

< 1.5.4
affected

References

github.com/...de-mcp/security/advisories/GHSA-g2jx-37x6-6438

github.com/ArcadeAI/arcade-mcp/pull/691

github.com/...ommit/44660d18ceb220600401303df860a31ca766c817

cve.org (CVE-2025-66454)

nvd.nist.gov (CVE-2025-66454)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.