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OpenAdvisories
High · 8.6 CVE-2025-58444 EUVD-2025-27271GHSA-g9hg-qhmf-q45m

MCP Inspector is Vulnerable to Potential Command Execution via XSS When Connecting to an Untrusted MCP Server

Published Sep 8, 2025 · Updated Sep 9, 2025 · Assigned by GitHub_M

Description

The MCP inspector is a developer tool for testing and debugging MCP servers. A cross-site scripting issue was reported in versions of the MCP Inspector local development tool prior to 0.16.6 when connecting to untrusted remote MCP servers with a malicious redirect URI. This could be leveraged to interact directly with the inspector proxy to trigger arbitrary command execution. Users are advised to update to 0.16.6 to resolve this issue.

Affected products

VendorProductAffectedFixed
modelcontextprotocol inspector < 0.16.6 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm @modelcontextprotocol/inspector < 0.16.6 0.16.6 GHSA-g9hg-qhmf-q45m

References