CVE-2026-39808

The vulnerability results from improper neutralization of special characters used in operating system commands (CWE-78). An attacker can supply crafted input data, which is then passed to a system command interpreter without proper sanitization. This allows injection and execution of arbitrary OS commands in the context of the vulnerable application.

An unauthenticated attacker can remotely execute arbitrary system commands on the device, leading to complete breach of confidentiality, integrity, and availability of the system (RCE).

Apply patches available from the vendor according to the references (https://fortiguard.fortinet.com/psirt/FG-IR-26-100). Until the update is applied, it is recommended to restrict network access to the FortiSandbox management interface exclusively to trusted hosts.

Fortinet FortiSandbox versions 4.4.0 through 4.4.8 inclusive

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Fortinet FortiSandbox contains an OS command injection vulnerability that could allow an unauthenticated attacker to execute unauthorized code or commands via crafted HTTP requests.