FortiSandbox 4.4.0-4.4.8 OS Command Injection Vulnerability
CVE-2026-39808 Published on April 14, 2026
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>
Known Exploited Vulnerability
This Fortinet FortiSandbox OS Command Injection Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Fortinet FortiSandbox contains an OS command injection vulnerability that could allow an unauthenticated attacker to execute unauthorized code or commands via crafted HTTP requests.
The following remediation steps are recommended / required by July 19, 2026: 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 applicab
Vulnerability Analysis
CVE-2026-39808 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors in an automatable fashion. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
What is a Shell injection Vulnerability?
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
CVE-2026-39808 has been classified to as a Shell injection vulnerability or weakness.
Products Associated with CVE-2026-39808
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Affected Versions
Fortinet FortiSandbox:- Version 4.4.0, <= 4.4.8 is affected.
- Version 23.4.4374 is affected.
- Version 23.4.4350 is affected.
- Version 23.3.4329 is affected.
- Version 23.1.4245 is affected.
- Version 22.2.4151 is affected.
- Version 22.2.4134 is affected.
- Version 22.1.4113 is affected.
- Version 21.4.4072 is affected.
- Version 21.3.4055 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.