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CVE-2026-39808

CRITICAL CVSS 3.1: 9.8 EPSS 93.2% ACTIVE EXPLOIT
Updated Oct 27, 2026
Fortinet

CISA Known Exploited Vulnerability (KEV)

This vulnerability is actively exploited in the wild. Immediate patching is strongly recommended.

Due Date: Jul 19, 2026

Parameter Value
CVSS 9.8 (CRITICAL)
Affected Versions 4.4.0 — 4.4.9
Type CWE-78 (OS Command Injection)
Vendor Fortinet
Public PoC Yes

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>

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

CWE-78 OS Command Injection

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Fortinet Fortisandbox
cpe:2.3:a:fortinet:fortisandbox:*:*:*:*:*:*:*:*
 4.4.0 <= 4.4.9

References 3

https://fortiguard.fortinet.com/psirt/FG-IR-26-100
psirt@fortinet.com
https://github.com/samu-delucas/CVE-2026-39808
134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026…
134c704f-9b21-4f2e-91b3-4a467353bcc0
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