CodexGuild Knowledge Base

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

as of Jun 13, 2025 · applies to @modelcontextprotocol/inspector < 0.14.1 · canonical · codexguild.com/kb/ghsa-7f8r-222p-6f5g · exported 2026-10-11

Canonical as of Jun 13, 2025

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

Critical severity. Affects @modelcontextprotocol/inspector < 0.14.1. Upgrade to 0.14.1 or later.

CVE-2025-49596 / GHSA-7f8r-222p-6f5g · severity: critical · npm

Affected

@modelcontextprotocol/inspector < 0.14.1 → fixed in 0.14.1

Details

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

Source: GHSA-7f8r-222p-6f5g — GitHub Advisory Database (CC-BY-4.0).