CVE-2026-9703 Grafana's data source proxy did not apply role-based access control to write requests forwarded to Loki data sources
Description
Grafana's data source proxy did not apply role-based access control to write requests forwarded to Loki data sources. A user holding only the Viewer role on an affected Grafana instance could send POST, PUT and DELETE requests through the proxy to the Loki rules API (/loki/api/v1/rules), allowing them to create, modify and delete Loki alerting rules. Because those rules are stored by Loki rather than by Grafana, the change took effect for every user of that Loki data source, not only for the Viewer who made the request. Exploitation requires an authenticated Viewer account on the Grafana instance and a configured Loki data source; no other privileges are needed. Both Grafana OSS and Grafana Enterprise are affected. The defect is in Grafana's data source proxy; Loki itself is not vulnerable and does not need to be patched.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Grafana Enterprise 13.0 | 13.0.0 → 13.0.3 | No fix stated |
| Grafana Enterprise 12.4 | 12.4.0 → 12.4.5 | No fix stated |
| Grafana Enterprise 12.3 | 12.3.0 → 12.3.8 | No fix stated |
| Grafana Enterprise 12.2 | 12.2.0 → 12.2.10 | No fix stated |
| Grafana Enterprise 12.0 | 12.0.0 → 12.1.10 | No fix stated |
| Grafana Enterprise 11.6 | 11.6.0 → 11.6.16 | No fix stated |
| Grafana Enterprise 8.0 | 8.0.0 → 11.5.10 | No fix stated |
| Grafana OSS 13.0 | 13.0.0 → 13.0.3 | No fix stated |
| Grafana OSS 12.4 | 12.4.0 → 12.4.5 | No fix stated |
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| Product | Affected versions | Fixed in |
|---|---|---|
| Grafana OSS 12.3 | 12.3.0 → 12.3.8 | No fix stated |
| Grafana OSS 8.0 | 8.0.0 → 12.3.0 | No fix stated |
References
- grafana.com grafana.com
Timeline
- Published
- Last modified