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Vulnerability · Published Jun 13, 2025 · Assigned by GitHub_M

CVE-2025-49596MCP Inspector proxy server lacks authentication between the Inspector client and proxy

Critical 9.4

In plain English

A critical-severity missing authentication in inspector from modelcontextprotocol. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 44.5% (higher than 99% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)9.4Critical
Exploit odds (30 days)44.5%top 1.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling2Nuclei, Public PoC

Official description

The MCP inspector is a developer tool for testing and debugging MCP servers. 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npm@modelcontextprotocol/inspector0.14.1GHSA-7f8r-222p-6f5g

Affected products (as reported)

VendorProductVersions
modelcontextprotocol inspector < 0.14.1

Weakness: CWE-306 · Vector: 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