CVE-2025-66454

| EUVD-2025-200280 MEDIUM
2025-12-02 [email protected] GHSA-g2jx-37x6-6438
Authentication Bypass
6.5
CVSS 3.1
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CVSS VectorNVD

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

Lifecycle Timeline

4
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 15, 2026 - 14:04 euvd
EUVD-2025-200280
Analysis Generated
Mar 15, 2026 - 14:04 vuln.today
CVE Published
Dec 02, 2025 - 19:15 nvd
MEDIUM 6.5

DescriptionNVD

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.

AnalysisAI

A security vulnerability in Arcade MCP (CVSS 6.5) that allows you. Remediation should follow standard vulnerability management procedures.

Technical ContextAI

CWE-321 (Hard-coded Cryptographic Key). Affects Arcade MCP.

RemediationAI

Monitor vendor channels for patch availability.

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CVE-2025-66454 vulnerability details – vuln.today
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