EXECUTIVE SUMMARY:
CVE-2026-25089, with a CVSS score of 9.1, is a critical OS command injection vulnerability affecting FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS deployments. The flaw stems from improper handling of specially crafted JSON input supplied to the “start VNC” endpoint, enabling attackers to inject and execute arbitrary operating-system commands through unauthenticated HTTP requests. An attacker requires only network access to the vulnerable web interface and no prior credentials to exploit the issue. Successful exploitation can result in full command execution on the underlying host, leading to complete compromise of the sandbox environment, unauthorized access to sensitive information, and potential lateral movement within connected networks. The business impact includes loss of data confidentiality and integrity, operational disruption, reputational harm, and possible regulatory consequences resulting from the breakdown of security isolation controls.[/subscribe_to_unlock_form]
EXECUTIVE SUMMARY:
CVE-2026-25089, with a CVSS score of 9.1, is a critical OS command injection vulnerability affecting FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS deployments. The flaw stems from improper handling of specially crafted JSON input supplied to the “start VNC” endpoint, enabling attackers to inject and execute arbitrary operating-system commands through unauthenticated HTTP requests. An attacker requires only network access to the vulnerable web interface and no prior credentials to exploit the issue. Successful exploitation can result in full command execution on the underlying host, leading to complete compromise of the sandbox environment, unauthorized access to sensitive information, and potential lateral movement within connected networks. The business impact includes loss of data confidentiality and integrity, operational disruption, reputational harm, and possible regulatory consequences resulting from the breakdown of security isolation controls.[emaillocker id="1283"]
RECOMMENDATION:
REFERENCES:
The following reports contain further technical details:
https://securityonline.info/cve-2026-25089-fortisandbox-patch/
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