MCPA-2026-0096
mcp-grafana X-Grafana-URL header server-side request forgery (CVE-2026-19516)
mcp-grafana before 1.1.0 honors a caller-supplied X-Grafana-URL request header that controls the destination of the server's outbound requests, and the grafana_api_request tool additionally lets the caller 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 cloud metadata endpoints) and read the responses, resulting in server-side request forgery. The earlier fix for CVE-2026-15583 prevented the configured service-account token from being sent to unintended destinations but did not restrict the destinations themselves. Fixed in 1.1.0, which removes support for the undocumented X-Grafana-URL header (grafana/mcp-grafana#1052).
Affected packages
| Ecosystem | Package | Affected versions |
|---|---|---|
| pypi | mcp-grafana | >= 0, < 1.1.0 |
Identifiers
CVE-2026-19516GHSA-fr94-7cqc-vjrqCWE-918
References
- advisory https://github.com/advisories/GHSA-fr94-7cqc-vjrq
- web https://nvd.nist.gov/vuln/detail/CVE-2026-19516
- web https://github.com/grafana/mcp-grafana/pull/1052
- web https://github.com/grafana/mcp-grafana/releases/tag/v1.1.0
Timeline
- Published: 2026-08-11