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.
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||
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| Grafana | Grafana Enterprise | unaffected |
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| Grafana | Grafana OSS | unaffected |
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Tracking
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Thu, 15 Oct 2026 14:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Viewer role can create, modify and delete Loki alerting rules | |
| Weaknesses | CWE-284 | |
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| Metrics |
cvssV3_1
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: GRAFANA
Published:
Updated: 2026-10-15T14:02:00.146Z
Reserved: 2026-05-27T12:38:34.129Z
Link: CVE-2026-9703
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-10-15T15:17:39.180
Modified: 2026-10-15T15:17:39.180
Link: CVE-2026-9703
Redhat
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OpenCVE Enrichment
No data.
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CWE-284
Improper Access Control