CVE-2025-8341: Grafana Infinity Plugin Auth Bypass Flaw

CVE-2025-8341 Overview

CVE-2025-8341 is a Server-Side Request Forgery (SSRF) vulnerability in the Grafana Infinity datasource plugin. The plugin, maintained by Grafana Labs, allows Grafana users to visualize data from JSON, CSV, XML, GraphQL, and HTML endpoints. Administrators can restrict which URLs the plugin is allowed to query using an allowlist configuration. An attacker with plugin access can bypass this restriction by supplying a specially crafted URL. Grafana Labs fixed the issue in Infinity datasource version 3.4.1. The weakness is classified as [CWE-918] Server-Side Request Forgery.

Critical Impact
Authenticated attackers can bypass the Infinity datasource URL allowlist and force the Grafana backend to issue HTTP requests to unintended internal or external endpoints.

Affected Products

Grafana Infinity datasource plugin versions prior to 3.4.1
Grafana deployments with the Infinity datasource configured with URL allowlist restrictions
Self-managed and Grafana Cloud instances using the vulnerable plugin

Discovery Timeline

2025-08-04 - CVE-2025-8341 published to the National Vulnerability Database
2025-08-04 - Grafana Labs publishes security advisory for CVE-2025-8341
2025-08-04 - Grafana Infinity datasource v3.4.1 released with the fix
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-8341

Vulnerability Analysis

The Infinity datasource plugin lets operators define an allowlist of URLs the plugin may query. This restriction is intended to prevent the Grafana backend from being used as a request proxy to arbitrary destinations. The vulnerability allows an attacker to construct a URL that matches the allowlist check while resolving to a different destination when the request is issued. The result is a Server-Side Request Forgery condition [CWE-918] executed from the Grafana server. Exploitation requires low privileges and no user interaction. The scope changes because the vulnerable component acts on behalf of Grafana against downstream systems.

Root Cause

The root cause is inconsistent URL parsing and validation inside the Infinity datasource plugin. The allowlist check evaluates the input URL differently than the HTTP client that ultimately dispatches the request. This parser mismatch enables an attacker-controlled string to pass validation while the outbound request targets a destination outside the allowlist.

Attack Vector

An attacker with permission to query the Infinity datasource submits a crafted URL through a Grafana panel, dashboard, or API call. The plugin validates the URL against the configured allowlist and accepts it. The backend then issues the HTTP request to a destination selected by the attacker. Common SSRF targets include cloud metadata services, internal management interfaces, and non-routable intranet hosts reachable only from the Grafana server.

No verified exploit code is publicly available. Refer to the Grafana Security Advisory CVE-2025-8341 and the GitHub Grafana Infinity Release v3.4.1 notes for technical context.

Detection Methods for CVE-2025-8341

Indicators of Compromise

Outbound HTTP requests from the Grafana server to internal IP ranges, cloud metadata endpoints such as 169.254.169.254, or hosts not present in the configured Infinity allowlist.
Grafana plugin logs showing Infinity datasource queries with unusual URL structures, encoded characters, or embedded credentials designed to confuse URL parsing.
Sudden increases in Infinity datasource query volume from a single Grafana user or API token.

Detection Strategies

Compare the URLs recorded in Infinity plugin query logs against the effective destinations observed in network egress logs from the Grafana host.
Alert when the Grafana server initiates connections to RFC1918 addresses, link-local addresses, or cloud provider metadata services.
Review Grafana audit logs for datasource query activity performed by low-privilege accounts that would not normally interact with Infinity.

Monitoring Recommendations

Forward Grafana application logs, plugin logs, and host network telemetry to a centralized analytics platform for correlation.
Baseline normal Infinity datasource destinations and alert on deviations, especially requests to new hostnames or private ranges.
Monitor the installed Infinity datasource version across all Grafana instances and flag any version below 3.4.1.

How to Mitigate CVE-2025-8341

Immediate Actions Required

Upgrade the Grafana Infinity datasource plugin to version 3.4.1 or later on every Grafana instance.
Inventory all Grafana deployments, including Grafana Cloud stacks and self-managed servers, to confirm which run the Infinity plugin.
Review Infinity datasource query history for suspicious URLs or requests to internal resources during the exposure window.

Patch Information

Grafana Labs addressed CVE-2025-8341 in Infinity datasource v3.4.1. Release notes and download details are available in the GitHub Grafana Infinity Release v3.4.1 page and the Grafana Security Advisory CVE-2025-8341. Grafana Cloud users should confirm that their managed plugin version is at or above 3.4.1.

Workarounds

If patching cannot occur immediately, restrict Infinity datasource access to trusted Grafana users and service accounts only.
Place the Grafana server behind an egress proxy that enforces destination allowlisting at the network layer, blocking access to metadata endpoints and internal management interfaces.
Disable the Infinity datasource plugin on Grafana instances that do not require it until the upgrade is complete.

bash

# Configuration example: upgrade the Infinity datasource plugin
grafana-cli plugins update yesoreyeram-infinity-datasource
# Verify installed version is 3.4.1 or later
grafana-cli plugins ls | grep infinity
# Restart Grafana to load the patched plugin
systemctl restart grafana-server