CVE-2026-39808Known exploitationPublic exploitNetwork attack vector

Unauthenticated root command execution via jid injection

Published Apr 14, 2026 · Updated Apr 14, 2026

OS command injection in Fortinet FortiSandbox 4.4.0 through 4.4.8 allows remote attackers to run root commands via crafted HTTP requests. The tracer-behavior endpoint treats pipe characters in the jid query parameter as shell command delimiters instead of neutralizing them. No authentication or user interaction is required; successful requests execute as root, and the CNA also identifies nine FortiSandbox PaaS builds as affected.

CVSS severity9.8
Critical
EPSS probability92.82%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Fortinet FortiSandbox 4.4.0 through 4.4.8 allows remote attackers to run root commands via crafted HTTP requests. The tracer-behavior endpoint treats pipe characters in the jid query parameter as shell command delimiters instead of neutralizing them. No authentication or user interaction is required; successful requests execute as root, and the CNA also identifies nine FortiSandbox PaaS builds as affected.

The record

CVE
CVE-2026-39808
Published
Apr 14, 2026
Updated
Apr 14, 2026
Vendor
Fortinet
Product
FortiSandbox
Classifications
CWE-78, CAPEC-88, T1059.004, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2026Record updatedLatest update available in the CVE record.
  3. Jul 16, 2026Exploitation reportedCISA Known Exploited Vulnerabilities Catalog entry

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.4.0 <=4.4.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fortinet · FortiSandboxversion=4.4.0 <=4.4.8
Fortinet · FortiSandbox PaaSversion=21.3.4055; version=21.4.4072; version=22.1.4113; version=22.2.4134; version=22.2.4151; version=23.1.4245; version=23.3.4329; version=23.4.4350; version=23.4.4374

Published CVSS scores

9.8Fortinet, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CAPEC-88OS Command Injection
T1059.004Unix Shell
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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