CVE-2026-9703Network attack vectorHinoki check available

Rule tampering via unchecked proxy writes

Published Oct 15, 2026 · Updated Oct 15, 2026

Access control failure in Grafana OSS and Enterprise allows remote authenticated users to alter Loki rules via the data source proxy. The proxy forwards POST, PUT, and DELETE requests to /loki/api/v1/rules without enforcing role-based write permissions. An authenticated Viewer account and a configured Loki data source suffice to create, modify, or delete rules stored in Loki, affecting every user of that data source.

CVSS severity7.1
High
EPSS probability0.19%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Access control failure in Grafana OSS and Enterprise allows remote authenticated users to alter Loki rules via the data source proxy. The proxy forwards POST, PUT, and DELETE requests to /loki/api/v1/rules without enforcing role-based write permissions. An authenticated Viewer account and a configured Loki data source suffice to create, modify, or delete rules stored in Loki, affecting every user of that data source.

The record

CVE
CVE-2026-9703
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
Grafana Labs
Product
Grafana OSS
Classifications
CWE-284, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.3.0 <=12.3.8
  2. Affected versionversion=12.4.0 <=12.4.5
  3. Affected versionversion=13.0.0 <=13.0.3
  4. Affected versionversion=8.0.0 <=12.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Grafana Labs · Grafana OSSversion=12.3.0 <=12.3.8; version=12.4.0 <=12.4.5; version=13.0.0 <=13.0.3; version=8.0.0 <=12.3.0
Grafana Labs · Grafana Enterpriseversion=11.6.0 <=11.6.16; version=12.0.0 <=12.1.10; version=12.2.0 <=12.2.10; version=12.3.0 <=12.3.8; version=12.4.0 <=12.4.5; version=13.0.0 <=13.0.3; version=8.0.0 <=11.5.10

Published CVSS scores

7.1Grafana Labs CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

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