CVE-2026-9703 Grafana - Broken Access Control

Grafana contains a broken access control vulnerability in its data source proxy forwarding write requests to Loki data sources, letting authenticated Viewer users create, modify, and delete Loki alerting rules, affecting all users of the Loki data source.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control, Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Published
15 October 2026
Updated
15 October 2026
Weakness
CWE-284

Vendor fix

Update to the latest Grafana version with the data source proxy fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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