CVE-2026-9703 (GCVE-0-2026-9703)

Vulnerability from cvelistv5 – Published: 2026-10-15 14:02 – Updated: 2026-10-16 18:52
VLAI
Title
Viewer role can create, modify and delete Loki alerting rules
Summary
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.
Severity
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 18:52 UTC
CWE
Assigner
GRAFANA CNA under the mitre root
CNA scorecard C 70/100 over 48 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Grafana Grafana Enterprise Affected: 8.0.0 , ≤ 11.5.10 (semver)
Affected: 11.6.0 , ≤ 11.6.16 (semver)
Affected: 12.0.0 , ≤ 12.1.10 (semver)
Affected: 12.2.0 , ≤ 12.2.10 (semver)
Affected: 12.3.0 , ≤ 12.3.8 (semver)
Affected: 12.4.0 , ≤ 12.4.5 (semver)
Affected: 13.0.0 , ≤ 13.0.3 (semver)
guessed Create a notification for this product.
Grafana Grafana OSS Affected: 12.3.0 , ≤ 12.3.8 (semver)
Affected: 12.4.0 , ≤ 12.4.5 (semver)
Affected: 8.0.0 , ≤ 12.3.0 (semver)
Affected: 13.0.0 , ≤ 13.0.3 (semver)
guessed Create a notification for this product.
Date Public
2026-06-27 13:19
Show details on NVD website
To clipboard 

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