CVE-2026-42129Network attack vector

Authenticated backend disclosure via resource path traversal

Published Jun 22, 2026 · Updated Jun 22, 2026

Path traversal in affected Grafana OSS releases allows remote authenticated users with Viewer permissions to read sensitive Loki backend data. The Loki data source plugin's callResource handler fails to confine a crafted resource path and forwards requests to administrative endpoints such as /config, /services, and /ready. Viewer access and a configured Loki data source are required; returned responses expose backend configuration and internal service details without reported write or service-interruption capability.

CVSS severity7.7
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in affected Grafana OSS releases allows remote authenticated users with Viewer permissions to read sensitive Loki backend data. The Loki data source plugin's callResource handler fails to confine a crafted resource path and forwards requests to administrative endpoints such as /config, /services, and /ready. Viewer access and a configured Loki data source are required; returned responses expose backend configuration and internal service details without reported write or service-interruption capability.

The record

CVE
CVE-2026-42129
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-22, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.7Grafana LabsCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

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

Your stack

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Your stack

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