Viewer role can create, modify and delete Loki alerting rules

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-9703
StatePUBLISHED
AssignerGRAFANA
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-15 15:17:39 UTC
Updated2026-10-16 20:02:37 UTC
DescriptionGrafana'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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

EPSS: 0.001950000 probability, percentile 0.085440000 (date 2026-10-16)

Problem Types: CWE-284 | CWE-284 CWE-284

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Grafana Grafana Enterprise affected 8.0.0 11.5.10 semver Not specified
CNA Grafana Grafana Enterprise affected 11.6.0 11.6.16 semver Not specified
CNA Grafana Grafana Enterprise affected 12.0.0 12.1.10 semver Not specified
CNA Grafana Grafana Enterprise affected 12.2.0 12.2.10 semver Not specified
CNA Grafana Grafana Enterprise affected 12.3.0 12.3.8 semver Not specified
CNA Grafana Grafana Enterprise affected 12.4.0 12.4.5 semver Not specified
CNA Grafana Grafana Enterprise affected 13.0.0 13.0.3 semver Not specified
CNA Grafana Grafana OSS affected 12.3.0 12.3.8 semver Not specified
CNA Grafana Grafana OSS affected 12.4.0 12.4.5 semver Not specified
CNA Grafana Grafana OSS affected 8.0.0 12.3.0 semver Not specified
CNA Grafana Grafana OSS affected 13.0.0 13.0.3 semver Not specified

References

ReferenceSourceLinkTags
grafana.com/security/security-advisories/cve-2026-9703 [email protected] grafana.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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