CVE-2026-42129

High

Description

A user with Viewer permissions can use a path traversal in the Loki data source plugin to reach administrative Loki endpoints and read sensitive backend configuration and internal service information.

SeverityHigh

CVSS7.7

Exploit probability—

Product

Grafana Loki Datasource

PublishedJun 22, 2026

First seenJun 22, 2026

Weakness typeCWE-22Path traversal

How to fix

Update

github.com/grafana/grafana1.9.2-0.20260616075434-82ef13993059 or later

Vendor advisories

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

Affected products

Product	Affected versions	Fixed in
grafana loki_datasource	No range specified	—
github.com/grafana/grafanaGo	2.0.0-beta1 ≤ v, 12.0.0 ≤ v, 12.3.0 ≤ v, 13.0.0 ≤ v, 12.4.0 ≤ v, v < 1.9.2-0.20260616075434-82ef13993059, No range specified, 2.0.0-beta1+incompatible ≤ v	1.9.2-0.20260616075434-82ef13993059

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