🛡️ CVE-2025-66454
🟡 CVSS 6.5 — Medium ✅ No Known Exploit CWE-284 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity Medium
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE CWE-284
Public Exploit âś… No
Source NVD
Published 2025-12-02
Updated 2026-06-02
Modified 2025-12-02
Fix URL N/A

Affected Packages

Software From version Fixed in
arcade-mcp-server — 1.9.1
unknown — —

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