Critical Grafana Vulnerabilities Enable Remote Code Execution and DoS Attacks

What happened

Critical Grafana vulnerabilities could allow attackers to achieve remote code execution and denial-of-service attacks, prompting urgent security updates for affected versions. The most severe issue, tracked as CVE-2026-27876, carries a CVSS score of 9.1 and affects Grafana’s SQL expressions feature. The flaw can let an attacker write arbitrary files directly to the server’s file system, which can then be chained into full remote code execution. Grafana Labs said the issue can be weaponized to gain an unauthorized SSH connection to the underlying host server. A second flaw, CVE-2026-27880, is a denial-of-service issue affecting OpenFeature validation endpoints and can allow attackers to crash a Grafana instance by sending excessively large requests. 

Who is affected

The direct exposure affects organizations using vulnerable Grafana deployments, especially where the sqlExpressions feature toggle is enabled and users have Viewer permissions or higher to execute data source queries. The denial-of-service issue also affects exposed Grafana instances through unauthenticated OpenFeature validation endpoints. 

Why CISOs should care

This matters because the reported issues affect a widely used data visualization platform and include both host-level compromise potential and service disruption risk. The remote code execution path is especially significant because it can move beyond the application itself and into the underlying server, while the second flaw can interrupt monitoring availability. 

3 practical actions

1. Upgrade to patched versions immediately: Move affected systems to Grafana 12.4.2, 12.3.6, 12.2.8, 12.1.10, 11.6.14, or other officially patched releases as applicable. 
2. Disable SQL expressions if patching is delayed: Turn off the sqlExpressions feature toggle to remove the reported remote code execution attack surface until upgrades are complete. 
3. Reduce DoS exposure at the edge: Deploy Grafana in a highly available environment and use a reverse proxy such as Nginx or Cloudflare to limit input payload sizes and reduce the memory exhaustion risk. 

For more news about security flaws that can lead to system compromise and service disruption, click Vulnerability to read more.