Vulnerability · Published Oct 15, 2026 · Assigned by GRAFANA
CVE-2026-9703Viewer role can create, modify and delete Loki alerting rules
High 7.1
In plain English
A high-severity improper access control in Grafana Enterprise from Grafana. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Grafana | Grafana Enterprise | 8.0.0 – through 11.5.1011.6.0 – through 11.6.1612.0.0 – through 12.1.1012.2.0 – through 12.2.1012.3.0 – through 12.3.812.4.0 – through 12.4.513.0.0 – through 13.0.3 |
| Grafana | Grafana OSS | 12.3.0 – through 12.3.812.4.0 – through 12.4.58.0.0 – through 12.3.013.0.0 – through 13.0.3 |
Weakness: CWE-284 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
References
- https://grafana.com/security/security-advisories/cve-2026-9703 vendor-advisory