Review reviewHigh

CVE-2026-42129

Grafana Grafana OSS, loki datasource

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.

CVSS
7.7
EPSS
0.44%
36.4% percentile
CISA KEV
Not listed
Published
2026.06.22
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.44%
Technical severityCVSS 7.7

Vulnerability overview

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.

Affected product and versions

Product
Grafana Grafana OSS, loki datasource
Affected versions
11.6.0, 12.2.0, 12.3.0, 12.4.0, 13.0.0
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Grafana Grafana OSS, loki datasource and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
CWE
CWE-22
CVE-2026-42129 — Grafana Grafana OSS, loki datasource | SECUFOCUS NOW