CVEvulnerability

CVE-2025-66454

6.5 MEDIUM Published 2025-12-02 Modified 2026-10-18 Official page ↗

Status: Deferred
Published: 2025-12-02
Last modified: 2026-10-18
Assigner: [email protected]
CVSS 3.1 ([email protected]): 6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weaknesses: CWE-321, CWE-798

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.

Weakness · CWE (2)

CWE-321 Use of Hard-coded Cryptographic Key weakness
CWE-798 Use of Hard-coded Credentials weakness

References

https://github.com/ArcadeAI/arcade-mcp/commit/44660d18ceb220600401303df860a31ca766c817 github.com
https://github.com/ArcadeAI/arcade-mcp/pull/691 github.com
https://github.com/ArcadeAI/arcade-mcp/security/advisories/GHSA-g2jx-37x6-6438 github.com

CVE-2025-66454

Description

Related

Weakness · CWE (2)

References