CVE-2026-42129 | The Loki datasource plugin's callResource handler contains a… | CVSS 7.7 HIGH

Description

The Loki datasource plugin's callResource handler contains a path traversal vulnerability. An authenticated Viewer-role user can escape the plugin's resource sandbox and access administrative Loki endpoints (e.g. /config, /services, /ready) to extract sensitive backend configuration and internal service information.

Metadata

CVE ID: CVE-2026-42129
State: PUBLISHED
Assigner: GRAFANA
Reserved: 2026-04-24 15:38 UTC
Published: 2026-06-22 13:18 UTC
Last updated: 2026-06-22 15:44 UTC
Vendor / Product: Grafana / Grafana OSS
Sources: cve.org · NVD

Severity & Metrics

7.7 HIGH CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
Grafana	Grafana OSS	OnPrem	—

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.7	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References (1)

https://grafana.com/security/security-advisories/cve-2026-42129