CVE-2026-17033: Grafana OSS

Medium severity, CVSS 6.8. EPSS: 0.2% chance of exploitation in the next 30 days.

An authenticated attacker with Editor access or alert.instances.external:write can submit an external Alertmanager alert containing a controlled generatorURL. The attacker is authorized to create the alert, but not to execute script in another user's Grafana session. Grafana renders alert.generatorURL directly as the Alert Details See source LinkButton href without URL-scheme sanitization or a safe-protocol allowlist. The click interceptor's :// heuristic can be bypassed by placing :// inside a JavaScript comment. When a user with read access clicks See source, the browser executes attacker-controlled JavaScript in the Grafana origin with the clicking user's permissions.

Affected products

• Grafana Grafana OSS: up to and including 12.3.11; from 12.4.0, up to and including 12.4.9; from 13.0.0, up to and including 13.0.7

Published 2026-08-24. Last modified 2026-08-31.