Actively exploited in the wild
Fortinet FortiSandbox OS Command Injection Vulnerability
Fortinet - FortiSandbox · Listed in the CISA KEV since 2026-07-16. This indicates confirmed attacks in production environments.
Required action: 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.
CVE-2026-39808
CriticalCVSS 9.8KEVExploitation Probability (EPSS)
Very high risk100th percentile - higher than 100% of all known CVEs
Summary
An OS command injection vulnerability has been discovered in Fortinet FortiSandbox versions 4.4.0 through 4.4.8. This flaw is due to improper neutralization of special elements used in OS commands.
Risk Assessment
An attacker can remotely execute unauthorized code or commands on the vulnerable device, potentially leading to full system compromise and data confidentiality breach.
Recommendation
It is recommended to immediately upgrade Fortinet FortiSandbox to version 4.4.9 or later, which includes a fix for this vulnerability.
Original NVD description (English source)
A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 4.4.0 through 4.4.8 may allow attacker to execute unauthorized code or commands via <insert attack vector here>