CVE-2025-66454CWE-321CWE-798hardcoded-credentials

CVE-2025-66454

Medium · published December 3, 2025

CVSS v3.1
6.5
EPSS
0%
Percentile
23.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00313 · 23.1th percentile
Weaknesses
CWE-321 · Use of Hard-coded Cryptographic Key; CWE-798 · Use of Hard-coded Credentials
Published
2025-12-03T00:15Z
References (3)
https://github.com/ArcadeAI/arcade-mcp/commit/44660d18ceb220600401303df860a31ca766c817 · [email protected]https://github.com/ArcadeAI/arcade-mcp/pull/691 · [email protected]https://github.com/ArcadeAI/arcade-mcp/security/advisories/GHSA-g2jx-37x6-6438 · [email protected]
EPSS history
Timeline
  • 02 DEC 18:23Z
    Arcade MCP Default Hardcoded Worker Secret Allows Full Unauthorized Access to All HTTP MCP Worker Endpoints
    cvelistv5