CVE-2026-27876 — Grafana Critical RCE via SQL Expression Chain

Executive Summary

A critical remote code execution (RCE) vulnerability (CVE-2026-27876) has been disclosed in Grafana affecting both OSS and Enterprise editions. The vulnerability arises from a chained attack combining the sqlExpression feature (available in Grafana OSS) with a Grafana Enterprise plugin. When successfully exploited, an attacker can achieve arbitrary code execution on the Grafana host.

CVSS Score: 9.1 (Critical) CWE: CWE-94 — Improper Control of Generation of Code

Because the attack path leverages a feature present in Grafana OSS, all Grafana users are at risk and should update regardless of whether they use Enterprise features.

Vulnerability Overview

Affected Products

Note: The sqlExpression feature is what enables the attack chain. Even users without the Enterprise plugin should update to prevent future attack surface exposure.

Technical Analysis

Attack Chain

The exploitation leverages two distinct components in a chained sequence:

1. SQL Expression feature (Grafana OSS): The sqlExpression datasource allows users to write SQL-like expressions against query results within Grafana panels. This feature was intended for data transformation but exposes a code evaluation path.

2. Enterprise Plugin (Grafana Enterprise): A Grafana Enterprise plugin provides an additional execution context that, when combined with a malformed or adversarially crafted SQL expression, enables escalation from data manipulation to arbitrary code execution on the host.

Root Cause

The root cause is inadequate sandboxing and input validation in the interaction between the sqlExpression evaluation engine and the Enterprise plugin's execution environment. Crafted SQL expression payloads can break out of the intended data-processing context and invoke system-level operations.

Exploitation Requirements

• An attacker must have authenticated access to a Grafana instance (low-privilege user account is sufficient)
• The sqlExpression feature must be enabled
• For the highest-impact chain, a Grafana Enterprise plugin must also be active

Impact Assessment

Immediate Remediation

Step 1: Update Grafana

Apply the latest Grafana security patch released in response to this advisory.

# Check current Grafana version
grafana-server --version
 
# For Docker-based deployments
docker pull grafana/grafana:latest
docker restart grafana
 
# For systemd-managed installs
apt-get update && apt-get install --only-upgrade grafana   # Debian/Ubuntu
yum update grafana                                           # RHEL/CentOS

Step 2: Disable sqlExpression If Not Required

If your organization does not actively use the sqlExpression feature, disable it as an interim mitigation:

# In grafana.ini — add or update under [feature_toggles]
[feature_toggles]
sqlExpressions = false

Step 3: Restrict Grafana Access

Limit who can create or edit panels with data transformations:

# Restrict viewer/editor roles from creating datasource queries
# Review and tighten RBAC permissions in Grafana Enterprise
# Disable self-service panel editing for untrusted users

Step 4: Review Grafana Enterprise Plugin Inventory

# List installed Grafana plugins
grafana-cli plugins ls
 
# Remove unused or unrecognized plugins
grafana-cli plugins remove <plugin-id>

Detection Indicators

# Monitor Grafana logs for SQL expression evaluation errors
tail -f /var/log/grafana/grafana.log | grep -i "sqlExpression\|expression eval"
 
# Check for unexpected child processes
ps auxf | grep grafana
 
# Monitor outbound connections from Grafana host
ss -tnp | grep grafana

Post-Remediation Checklist

1. Update Grafana to the patched version and verify the version string
2. Disable sqlExpressions feature toggle if not operationally required
3. Audit Grafana RBAC — ensure least-privilege access for all users
4. Review installed plugins and remove any unused or unverified plugins
5. Rotate any secrets or credentials stored in Grafana datasources as a precaution
6. Monitor Grafana logs for any anomalous activity following patching
7. Document the remediation in your vulnerability management system

References

• NVD — CVE-2026-27876
• Grafana Security Advisories
• CWE-94 — Improper Control of Generation of Code