CVE-2026-19516: Grafana Mcp Server

Critical severity, CVSS 9.1. EPSS: 0.3% chance of exploitation in the next 30 days.

A caller-supplied X-Grafana-URL request header controls the destination of mcp-grafana's outbound requests, and the grafana_api_request tool lets the caller also choose the HTTP method, path, and body. Because the destination is not restricted to the configured Grafana instance, a 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. 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.

Affected products

• Grafana Grafana Mcp Server: from 0.0.0, up to and including 1.0.0
• Grafana Mcp-Grafana: from 0.0.0, up to and including 1.0.0

Published 2026-08-11. Last modified 2026-08-31.