Critical Grafana Flaws Allow Remote Code Execution

Key Takeaways

• Grafana has issued critical security updates for two significant vulnerabilities, one allowing remote code execution (RCE) and the other a denial-of-service (DoS) attack.
• The RCE flaw (CVE-2026-27876) carries a CVSS score of 9.1 and affects Grafana’s SQL expressions feature, enabling arbitrary file writes and potential SSH access.
• The DoS vulnerability (CVE-2026-27880), rated 7.5 CVSS, impacts unauthenticated OpenFeature validation endpoints, leading to system crashes.
• Patches are available in Grafana versions 12.4.2, 12.3.6, 12.2.8, 12.1.10, and 11.6.14. Immediate upgrades are strongly recommended.

Grafana, a widely used open-source platform for data visualization and monitoring, has released urgent security patches to address two critical vulnerabilities. These flaws, if exploited, could grant attackers remote code execution (RCE) capabilities or trigger denial-of-service (DoS) attacks, posing significant risks to systems utilizing the platform.

System administrators overseeing Grafana deployments are strongly urged to apply these newly released security updates without delay to safeguard against potential compromise and maintain operational integrity.

Critical SQL Expressions RCE Vulnerability

The more severe of the two issues, identified as CVE-2026-27876, has been assigned a critical CVSS score of 9.1. This vulnerability resides within Grafana’s SQL expressions feature, which allows users to perform advanced data manipulations.

Exploitation of this flaw enables an attacker to write arbitrary files directly to the server’s file system. This capability can then be combined with other attack vectors to achieve full remote code execution on the underlying host.

Grafana Labs confirmed that this specific exploit path could be leveraged to establish unauthorized SSH connections to the host server, granting attackers deep access.

Successful exploitation of CVE-2026-27876 requires an attacker to possess at least “Viewer” permissions, enabling them to execute data source queries. Additionally, the target Grafana instance must have the sqlExpressions feature toggle actively enabled. If these conditions are met, an attacker could overwrite a Sqlyze driver or maliciously manipulate an AWS data source configuration file to achieve their objectives.

The discovery and responsible disclosure of this critical vulnerability were credited to Liad Eliyahu at Miggo Security, underscoring the importance of continuous external security audits.

High-Severity Unauthenticated DoS Vulnerability

The second vulnerability, CVE-2026-27880, is a high-severity denial-of-service flaw with a CVSS score of 7.5. This issue impacts Grafana’s OpenFeature validation endpoints.

These particular endpoints are problematic because they do not require any authentication and are designed to accept unbounded user input into memory. This design oversight creates an easy pathway for threat actors to overwhelm the system.

By simply sending excessively large requests to these endpoints, attackers can quickly exhaust available memory, causing the Grafana instance to crash. Such an incident would lead to significant operational downtime for crucial monitoring and visualization services.

What You Should Do

Grafana Labs strongly advises all administrators to upgrade immediately to one of the officially patched versions:

• Grafana 12.4.2
• Grafana 12.3.6
• Grafana 12.2.8
• Grafana 12.1.10
• Grafana 11.6.14

Organizations using managed cloud services, such as Amazon Managed Grafana and Azure Managed Grafana, can rest assured, as their environments have already been secured under embargo.

For organizations unable to upgrade immediately, several mitigation steps can be taken:

• For the RCE vulnerability (CVE-2026-27876): Completely disable the sqlExpressions feature toggle to eliminate the attack surface.
• For the DoS vulnerability (CVE-2026-27880):
  • Deploy Grafana in a highly available environment to ensure rapid automatic recovery in case of a crash.
  • Implement a robust reverse proxy (e.g., Nginx or Cloudflare) to strictly limit the size of input payloads, effectively neutralizing the memory exhaustion vector.

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