CVE-2025-58444: Modelcontextprotocol Inspector

High severity, CVSS 8.6. EPSS: 0.7% chance of exploitation in the next 30 days.

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

• Modelcontextprotocol Inspector: before 0.16.6 (fixed in 0.16.6)

Published 2025-09-08. Last modified 2026-06-17.