CVE-2026-104120: Modelcontextprotocol Mcp-Server-Everything

High severity, CVSS 7.3. EPSS: 0.3% chance of exploitation in the next 30 days.

A security vulnerability has been detected in modelcontextprotocol mcp-server-fetch and mcp-server-everything up to 2026.6.4. Affected is the function fetch_url of the file mcp_server_fetch/server.py of the component Fetch Tool. The manipulation of the argument url/path leads to server-side request forgery. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. The pull request to fix this issue awaits acceptance.

Affected products

• Modelcontextprotocol Mcp-Server-Everything: version 2026.6.0 only; version 2026.6.1 only; version 2026.6.2 only; version 2026.6.3 only; version 2026.6.4 only
• Modelcontextprotocol Mcp-Server-Fetch: version 2026.6.0 only; version 2026.6.1 only; version 2026.6.2 only; version 2026.6.3 only; version 2026.6.4 only

Published 2026-10-02. Last modified 2026-10-06.