CVE-2025-66454

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 endpointsincluding tool enumeration and tool invocationwithout credentials. This vulnerability is fixed in 1.5.4.

Risk Information

Base Score

6.5

MODERATE

Vector

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

EPSS Score

Exploitation Probability

0.317

Associated Vulnerability

Vulnerability	OS Platform
Vulnerabilities CVE-2025-66454 are fixed in Python-arcade-mcp-server 1.9.1	Windows
Vulnerabilities CVE-2025-66454 are fixed in Python-arcade-mcp-server for linux 1.9.1	Linux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234