CVE-2026-9703 is a vulnerability in Grafana Labs Grafana

CVE-2026-9703 is a vulnerability in Grafana Labs Grafana
Published on October 15, 2026

Viewer role can create, modify and delete Loki alerting rules
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.

Weakness Type

What is an Authorization Vulnerability?

The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

CVE-2026-9703 has been classified to as an Authorization vulnerability or weakness.

Products Associated with CVE-2026-9703

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Affected Versions

Version 8.0.0, <= 11.5.10 is affected.

Version 11.6.0, <= 11.6.16 is affected.

Version 12.0.0, <= 12.1.10 is affected.

Version 12.2.0, <= 12.2.10 is affected.

Version 12.3.0, <= 12.3.8 is affected.

Version 12.4.0, <= 12.4.5 is affected.

Version 13.0.0, <= 13.0.3 is affected.