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.
Scores
CVSS v3
6.5
EPSS
0.0029
EPSS Percentile
52.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-321
CWE-798
Status
published
Products (2)
ArcadeAI/arcade-mcp
< 1.5.4
pypi/arcade-mcp-server
0 - 1.9.1PyPI
Published
Dec 02, 2025
Tracked Since
Feb 18, 2026