Grafana has issued urgent security updates for version 12.4.2, addressing two critical vulnerabilities that could lead to remote code execution (RCE) and denial-of-service (DoS) attacks. Administrators using Grafana for data visualization are strongly encouraged to apply these updates immediately to protect their systems from potential threats.
Details of the RCE Vulnerability
The most severe vulnerability, identified as CVE-2026-27876, has been given a critical CVSS score of 9.1. This issue arises from a flaw within Grafana’s SQL expressions feature. It allows attackers to write arbitrary files to the server’s file system, potentially leading to complete remote code execution.
Grafana Labs has confirmed that this vulnerability can be exploited to establish unauthorized SSH access to the host server. To exploit CVE-2026-27876, attackers must have Viewer permissions or higher and the sqlExpressions feature must be enabled. Once these conditions are met, an attacker can manipulate Sqlyze drivers or AWS data source configurations maliciously.
Denial-of-Service Vulnerability Impact
The second vulnerability, CVE-2026-27880, is a high-severity DoS flaw with a CVSS score of 7.5, affecting the OpenFeature validation endpoints. As these endpoints do not require authentication and accept unbounded user input, they can be exploited to crash the Grafana instance by sending large requests.
Grafana Labs advises upgrading to patched versions, including 12.4.2, 12.3.6, 12.2.8, 12.1.10, and 11.6.14. Managed cloud services like Amazon Managed Grafana and Azure Managed Grafana have been secured under embargo.
Preventive Measures and Future Outlook
Organizations unable to upgrade immediately can disable the sqlExpressions feature toggle to prevent RCE attacks temporarily. To mitigate DoS risks, deploying Grafana in a highly available environment ensures rapid recovery and implementing a reverse proxy like Nginx or Cloudflare can limit input payload sizes.
These swift updates demonstrate Grafana’s dedication to maintaining a secure platform for enterprise and open-source users. Follow us on Google News, LinkedIn, and X for the latest cybersecurity news. Contact us to feature your stories.
