9.1 Critical Exploited

CVE-2026-39808 Fortinet FortiSandbox OS Command Injection Vulnerability

Active exploitation observed

· CISA KEV catalogue

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.

Ransomware campaigns Not observed so far

Weakness CWE-78

Description

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>

Affected products and versions

Product	Affected versions	Fixed in
FortiSandbox 4.4	4.4.0 → 4.4.8	No fix stated
FortiSandbox PaaS 23.4	23.4.4350 → 23.4.4374	No fix stated
FortiSandbox PaaS	23.3.4329	No fix stated
FortiSandbox PaaS	23.1.4245	No fix stated
FortiSandbox PaaS 22.2	22.2.4134 → 22.2.4151	No fix stated
FortiSandbox PaaS	22.1.4113	No fix stated
FortiSandbox PaaS	21.4.4072	No fix stated
FortiSandbox PaaS	21.3.4055	No fix stated

References

fortiguard.fortinet.com fortiguard.fortinet.com

Timeline

Published April 14, 2026
Added to the KEV catalogue July 16, 2026
Last modified July 17, 2026

The 52 CVEs of FortiSandbox →

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