CVE-2022-21703: Grafana CSRF Privilege Escalation Flaw

CVE-2022-21703 Overview

CVE-2022-21703 is a Cross-Site Request Forgery (CSRF) vulnerability affecting Grafana, the open-source monitoring and observability platform. The flaw allows remote attackers to elevate privileges by mounting cross-origin attacks against authenticated high-privilege Grafana users such as Editors or Admins. An attacker can exploit this issue by tricking an authenticated user into visiting a malicious page that submits forged requests to a Grafana instance. The forged requests can invite an attacker-controlled account as a new user with elevated privileges. The vulnerability is tracked under CWE-352: Cross-Site Request Forgery and impacts deployments shipped by Grafana Labs, NetApp E-Series Performance Analyzer, and Fedora.

Critical Impact
Successful exploitation allows attackers to gain administrative access to Grafana, exposing dashboards, data sources, and connected backend systems to full compromise.

Affected Products

Grafana Grafana (multiple versions prior to 7.5.15 and 8.3.5)
NetApp E-Series Performance Analyzer
Fedora 34, 35, and 36

Discovery Timeline

2022-02-08 - Grafana releases versions 7.5.15 and 8.3.5 with the security fix
2022-02-08 - CVE-2022-21703 published to NVD
2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-21703

Vulnerability Analysis

The vulnerability stems from insufficient cross-origin request validation in Grafana's HTTP API. Grafana relied on origin and content-type checks that could be bypassed under specific conditions, allowing state-changing requests to be issued from attacker-controlled origins. When a privileged user with an active Grafana session visits a malicious page, the browser automatically includes session cookies with the forged request. The Grafana backend then processes the request as if it were legitimate user action.

The attack requires user interaction, since the victim must visit a malicious site while authenticated to Grafana. However, no special privileges are required from the attacker beyond knowledge of the target instance. Once exploited, the attacker can invite a new user with Admin or Editor role, then authenticate using that account to access dashboards, data sources, and configured alerting integrations.

Root Cause

The root cause is improper enforcement of cross-origin protections on authenticated endpoints, including the user invitation API. Grafana's CSRF defenses did not adequately validate the Origin and Referer headers for all state-changing requests, allowing forged POST requests from cross-origin contexts to succeed.

Attack Vector

The attack is delivered over the network through a malicious web page or HTML email. The attacker hosts a page that auto-submits a forged form or fetch request targeting the victim's Grafana instance. The victim's browser sends the request along with valid session cookies, and Grafana executes the request under the victim's identity. See the GitHub Security Advisory GHSA-cmf4-h3xc-jw8w and the Grafana Blog Security Fixes for detailed technical context.

Detection Methods for CVE-2022-21703

Indicators of Compromise

Unexpected user invitations or new accounts appearing in the Grafana user management interface
Audit log entries showing org user additions originating from privileged accounts at unusual times
HTTP requests to /api/org/invites or /api/org/users with Referer or Origin headers pointing to external domains
New admin or editor role assignments not tied to an authorized change ticket

Detection Strategies

Review Grafana audit logs and database user and org_user tables for newly created accounts with elevated roles
Monitor reverse proxy or web application firewall logs for POST requests to Grafana API endpoints carrying external Origin or Referer headers
Correlate browser session activity with API state changes to flag privileged actions that lack interactive user context

Monitoring Recommendations

Enable Grafana's built-in audit logging and forward events to a centralized SIEM for retention and alerting
Alert on creation of new Admin or Editor accounts and on changes to organization role assignments
Track outbound traffic from privileged users' workstations to identify visits to suspicious domains during active Grafana sessions

How to Mitigate CVE-2022-21703

Immediate Actions Required

Upgrade Grafana to version 7.5.15, 8.3.5, or later as documented in the vendor advisory
Audit existing Grafana organizations for unauthorized user accounts and role assignments, removing any that cannot be verified
Force re-authentication of all active sessions after patching to invalidate any session leveraged during the exposure window
Apply distribution-specific updates for Fedora 34, 35, and 36, and the NetApp E-Series Performance Analyzer fix referenced in NetApp Security Advisory ntap-20220303-0005

Patch Information

Grafana Labs addressed the issue in versions 7.5.15 and 8.3.5, released on February 8, 2022. The fix is documented in GitHub Pull Request 45083 and the Grafana Blog Security Fixes. Fedora packages are updated through the Fedora Package Announcement channel.

Workarounds

The vendor advisory states there are no known workarounds; upgrading is required to fully remediate the issue
As interim defense-in-depth, restrict network access to Grafana so the application is reachable only from trusted networks or via VPN
Instruct administrators and editors to log out of Grafana when not actively using it and to avoid browsing untrusted sites in the same browser session

bash

# Verify Grafana version after upgrade
grafana-server -v

# Example minimum patched versions
# grafana >= 7.5.15
# grafana >= 8.3.5