CVE-2026-19516
Description
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.
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Grafana Grafana MCP Server | v ≤ 1.0.0 | — |
| Grafana mcp-grafana | v ≤ 1.0.0 | — |
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Attack Surface Management
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