Grafana MCP server-side request forgery via X-Grafana-URL header (grafana_api_request)

A caller who can invoke the grafana_api_request tool can supply an X-Grafana-URL request header to control the destination of mcp-grafana’s outbound requests, and can also choose the HTTP method, path, and body. Because the destination isn’t restricted to the configured Grafana instance, the caller can direct requests at internal, loopback, and link-local network services (including metadata endpoints) and read the responses, resulting in server-side request forgery (SSRF). The fix for CVE-2026-15583 prevented the configured service-account token from being sent to unintended destinations but did not restrict the destinations themselves. Upgrade to a fixed version listed below.