Viewer role can create, modify and delete Loki alerting rules

Grafana's data source proxy did not apply role-based access control to write requests forwarded to Loki data sources. A user holding only the Viewer role on an affected Grafana instance could send POST, PUT and DELETE requests through the proxy to the Loki rules API /loki/api/v1/rules, allowing...

CVE-2026-21726

The CVE-2021-36156 fix validates the namespace parameter for path traversal sequences after a single URL decode, by double encoding, an attacker can read files at the Ruler API endpoint /loki/api/v1/rules/namespace Thanks to Prasanth Sundararajan for reporting this vulnerability...

CVE-2026-21726

The CVE-2021-36156 fix validates the namespace parameter for path traversal sequences after a single URL decode, by double encoding, an attacker can read files at the Ruler API endpoint /loki/api/v1/rules/namespace Thanks to Prasanth Sundararajan for reporting this vulnerability...

PT-2023-25652 · Grafana +1 · Loki +2

Name of the Vulnerable Software and Affected Versions: ProLion CryptoSpike version 3.0.15P2 Description: The issue allows remote attackers to impersonate other users in web management and the REST API by reading JWT tokens from logs as a Grafana authenticated user or from the Loki REST API withou...