CVE-2026-39808FortinetOtherJuly 16, 2026

Fortinet FortiSandbox OS Command Injection Vulnerability

Critical 9.8Actively exploited

Description

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

What to do

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.

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Details

Vendor
Fortinet
Product
FortiSandbox
CVE
CVE-2026-39808
Affected versions
FortiSandbox 4.4: from 4.4.0 to 4.4.8
FortiSandbox PaaS 23.4: 23.4.4350; 23.4.4374
FortiSandbox PaaS 23.3: 23.3.4329
FortiSandbox PaaS 23.1: 23.1.4245
FortiSandbox PaaS 22.2: 22.2.4134; 22.2.4151
FortiSandbox PaaS 22.1: 22.1.4113
FortiSandbox PaaS 21.4: 21.4.4072
FortiSandbox PaaS 21.3: 21.3.4055 (from the advisory and NVD; check the exact builds in the official advisory)
CVSS score
9.8
Actively exploited
Yes, listed in the CISA Known Exploited Vulnerabilities catalog
CISA due date
July 19, 2026 (deadline for US federal agencies: a good benchmark for you too)
Source
CISA KEV – original advisory
Published
July 16, 2026

The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.

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