Critical Grafana Flaws Allow Remote Code Execution by Attackers

Grafana has released urgent security updates for version 12.4.2, addressing two critical vulnerabilities. Exploiting these flaws could allow attackers to achieve full remote code execution (RCE) and execute denial-of-service (DoS) attacks.

System administrators utilizing Grafana for data visualization are strongly advised to apply these backported patches immediately to prevent potential system compromise.

The most severe vulnerability, tracked as CVE-2026-27876, carries a critical CVSS score of 9.1 and originates in Grafana’s SQL expressions feature.

This flaw allows an attacker to write arbitrary files directly to the server’s file system, which can be chained with other vectors to achieve full remote code execution.

SQL Expressions RCE Vulnerability

Grafana Labs confirmed that this specific exploit path can be weaponized to acquire an unauthorized SSH connection directly to the underlying host server.

To successfully exploit CVE-2026-27876, an attacker must possess Viewer permissions or higher to execute data source queries, and the target must have the sqlExpressions feature toggle actively enabled.

Once these strict prerequisites are met, an attacker can overwrite a Sqlyze driver or maliciously manipulate an AWS data source configuration file.

The vulnerability was responsibly disclosed by Liad Eliyahu at Miggo Security, highlighting the continuous need for rigorous external security audits.

Unauthenticated DoS Vulnerability

The second vulnerability, CVE-2026-27880, is a high-severity denial-of-service (DoS) flaw with a CVSS score of 7.5 that affects the OpenFeature validation endpoints.

Because these endpoints do not require authentication and unquestioningly accept unbounded user input into memory, threat actors can easily overwhelm the system.

By sending excessively large requests, attackers can instantly crash the Grafana instance and cause severe operational downtime for monitoring services.

Grafana Labs strongly urges all administrators to upgrade immediately to one of the officially patched versions, including Grafana 12.4.2, 12.3.6, 12.2.8, 12.1.10, and 11.6.14.

Organizations relying on managed cloud services can remain confident, as Amazon Managed Grafana and Azure Managed Grafana environments have already been secured under embargo.

These rapid updates underscore Grafana’s commitment to maintaining a secure ecosystem for its enterprise and open-source users.

For organizations unable to upgrade immediately, completely turning off the sqlExpressions feature toggle will temporarily eliminate the RCE attack surface.

To actively defend against the DoS vulnerability without patching, administrators should deploy Grafana in a highly available environment to ensure rapid automatic recovery.

Additionally, implementing a robust reverse proxy, such as Nginx or Cloudflare, to strictly limit input payload sizes will effectively neutralize the memory exhaustion vector.

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