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CVE-2026-9703

Viewer role can create, modify and delete Loki alerting rules

High7.1EPSS 0.19%
Published
Updated
Reserved
Assigned by
GRAFANA

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.

Scores

CVSS scores of CVE-2026-9703, by who scored it
Scored byCVSSScoreVector
GRAFANACNA (assigner)3.1High7.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
NVDNVD · Awaiting Analysis3.1High7.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
EPSS (exploitation in 30 days)
0.19% · top 91% of all CVEs (5 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.

Weakness

Affected products

  • Grafana · Grafana Enterprise

    • affected 8.0.0 – ≤ 11.5.10
    • affected 11.6.0 – ≤ 11.6.16
    • affected 12.0.0 – ≤ 12.1.10
    • affected 12.2.0 – ≤ 12.2.10
    • affected 12.3.0 – ≤ 12.3.8
    • affected 12.4.0 – ≤ 12.4.5
    • affected 13.0.0 – ≤ 13.0.3

  • Grafana · Grafana OSS

    • affected 12.3.0 – ≤ 12.3.8
    • affected 12.4.0 – ≤ 12.4.5
    • affected 8.0.0 – ≤ 12.3.0
    • affected 13.0.0 – ≤ 13.0.3

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .