What’s Vulnerable › Vulnerabilities

CVE-2025-58444: MCP Inspector is Vulnerable to Potential Command Execution via XSS When Connecting to an Untrusted MCP Server

• Severity: high (CVSS 8.6 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-08 · updated 2026-06-17
• Weakness: CWE-84

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

• modelcontextprotocol inspector: before 0.16.6

References

• https://github.com/modelcontextprotocol/inspector/commit/650f3090d26344a672026b737d81586595bb1f60
• https://github.com/modelcontextprotocol/inspector/security/advisories/GHSA-g9hg-qhmf-q45m

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