CVE-2026-39808

Published Apr 14, 2026

Last updated 15 days ago

Zero-day

Fortinet FortiSandbox

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-39808 is an operating system (OS) command injection vulnerability affecting Fortinet FortiSandbox versions 4.4.0 through 4.4.8. This flaw stems from the improper neutralization of special elements used in OS commands, which allows attackers to inject malicious commands into system operations. Successful exploitation of CVE-2026-39808 enables remote attackers to execute unauthorized code or commands on the target system. This can be achieved without requiring any authentication or user interaction, typically through specially crafted HTTP requests to an API endpoint.

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>
Source: psirt@fortinet.com
NVD status: Analyzed
Products: fortisandbox

Risk scores

CVSS 3.1

Type: Secondary
Base score: 9.8
Impact score: 5.9
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: CRITICAL

Known exploits

Data from CISA

Vulnerability name: Fortinet FortiSandbox OS Command Injection Vulnerability
Exploit added on: Jul 16, 2026
Exploit action due: Jul 19, 2026
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.

Weaknesses

psirt@fortinet.com: CWE-78

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:fortinet:fortisandbox:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "94FFE14D-51FF-4D31-A0FD-5B0877081A04",
            "versionEndIncluding": "4.4.9",
            "versionStartIncluding": "4.4.0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.