Grafana security advisory (AV26-860)
Canada's Cyber Centre warned that Grafana Alloy versions through 1.18.1 are affected by CVE-2026-19516 and urged users to apply available updates.
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CVE-2026-19516
- CVSS 3.1
- 9.1 critical
- EPSS
- <1%p15
- Published
- ·
- Modified
Description · NVD
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.
- Weakness
- CWE-918
- Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L