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CVE-2025-49596 — Vulnerability in @modelcontextprotocol/inspector...

CRITICAL

MCP Inspector proxy server lacks authentication between the Inspector client and proxy

Published June 13, 2025Updated July 9, 2025Source: osv

Summary

Versions of MCP Inspector below 0.14.1 are vulnerable to remote code execution due to lack of authentication between the Inspector client and proxy, allowing unauthenticated requests to launch MCP commands over stdio. Users should immediately upgrade to version 0.14.1 or later to address these vulnerabilities. Credit: Rémy Marot <bughunters@tenable.com>

Advisory Timeline

  • First published June 13, 2025 (486 days ago).
  • Last revised July 9, 2025 — 26 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update @modelcontextprotocol/inspector to 0.14.1 or later
npm install @modelcontextprotocol/inspector@0.14.1

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: npm (1).

PackageEcosystemAffectedFixed In
@modelcontextprotocol/inspector
npm
All versions0.14.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.6 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
—
Confidentiality
—
Integrity
—
Availability
—

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

References

Frequently Asked Questions

What is CVE-2025-49596?
MCP Inspector proxy server lacks authentication between the Inspector client and proxy This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.6/10).
How do I check if my project is affected by CVE-2025-49596?
CVE-2025-49596 affects @modelcontextprotocol/inspector. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-49596 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.6

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-7f8r-222p-6f5g

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