CVE-2026-19516

9.1 criticalEPSS 0.3%

Critical (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.

Severity

CVSS 3.1

9.1 critical

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 23% of CVEs (scores of 2026-10-31)
CWE: CWE-918
Published: 2026-08-11
Modified: 2026-08-31
Record from: the NVD, synced 2026-10-19

References

https://grafana.com/security/security-advisories/cve-2026-19516

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