The MCP inspector — Xss (CVE-2025-58444)
Date: 2025-09
Attack vector: xss
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2025-58444
CWE: CWE-84

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.


Mitigations:

Architectural layers (MAESTRO):