Path Traversal Issue in Loki Datasource Plugin by Grafana
CVE-2026-42129

7.7HIGH

Key Information:

Vendor

Grafana
Status
Grafana Oss
Vendor
CVE Published:
22 June 2026

What is CVE-2026-42129?

The Loki datasource plugin is affected by a path traversal vulnerability in its callResource handler. This flaw allows authenticated users with Viewer-role access to bypass the plugin's resource sandbox restrictions. As a result, they can gain unauthorized access to sensitive administrative Loki endpoints such as /config, /services, and /ready, thereby compromising sensitive backend configurations and exposing critical internal service information.

References

https://grafana.com/security/security-advisories/cve-2026...
vendor-advisory

CVSS V3.1

Score:
7.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

khanmarshal (Researcher)
.