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CVE-2025-66454

Published: Dec 2, 2025

Modified: Dec 2, 2025

PUBLISHED

CVSS v3.1

6.5

MEDIUM

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.

Vendor	Product	Versions
ArcadeAI	arcade-mcp	affected `< 1.5.4`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

References

https://github.com/ArcadeAI/arcade-mcp/security/advisories/GHSA-g2jx-37x6-6438

x_refsource_CONFIRM

https://github.com/ArcadeAI/arcade-mcp/pull/691

x_refsource_MISC

https://github.com/ArcadeAI/arcade-mcp/commit/44660d18ceb220600401303df860a31ca766c817

x_refsource_MISC

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