Fortinet FortiSandbox's OS Command Injection Gives Unauthenticated Attackers Remote Code Execution via Crafted HTTP Requests; CISA's July 19th KEV Deadline Has Passed

Last refreshed2026-09-27

Status: KEV | Advisory ID: CVE-2026-39808

Key Details

CVE	CVE-2026-39808
Vulnerability Name	Fortinet FortiSandbox OS Command Injection Vulnerability
Affected products	Fortinet FortiSandbox
Exploitation status	Listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation.
Classified as	CWE-78 (Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'))
KEV listing	Added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-07-16.
Exploitation prediction (EPSS)	47.36% probability of exploitation in the next 30 days (99% percentile) -- FIRST.org's EPSS model.
Federal remediation deadline	2026-07-19 (CISA KEV, Binding Operational Directive).

Affected Products, Subsystems & Sectors

Vendor	Product	Affected Versions	Patch Status
Fortinet	FortiSandbox

Vendor

Product

Affected Versions

Patch Status

Fortinet

FortiSandbox

Subsystems	General OT
Sectors	Multiple

What to Know

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

Monitor Fortinet's web page for any future patch releases.

References

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-39808
CVE	https://www.cve.org/CVERecord?id=CVE-2026-39808

Source

Reference

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-39808

CVE

https://www.cve.org/CVERecord?id=CVE-2026-39808

KEV Required Action

Field	Value
KEV Link	https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Date Added to KEV	2026-07-16
Required Action Due Date	2026-07-19
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.

Field

Value

KEV Link

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Date Added to KEV

2026-07-16

Required Action Due Date

2026-07-19

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.