CVE-2025-66454

The CVE-2025-66454 issue in arcade-mcp-server/arcade-mcp is a hardcoded default worker secret ("dev") used by the HTTP server. Prior to version 1.5.4, this secret is never validated/rotated during startup, enabling unauthenticated attackers who know the key to forge valid JWTs and bypass FastAPI ...

CVE-2025-66454 Arcade MCP Default Hardcoded Worker Secret Allows Full Unauthorized Access to All HTTP MCP Worker Endpoints

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...