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CVE-2026-39808

Fortinet FortiSandbox OS Command Injection

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 47.4%
  1. Published14 Apr 2026
  2. Added to CISA KEV16 Jul 2026
  3. Remediation due19 Jul 2026
Actively exploited (CISA KEV)

Fortinet FortiSandbox contains an OS command injection vulnerability that could allow an unauthenticated attacker to execute unauthorized code or commands via crafted HTTP requests.

Added to KEV: 16 Jul 2026Federal remediation due: 19 Jul 2026

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>

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Fortinet Fortisandbox≥ 4.4.0 ≤ 4.4.9

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2026-39808 being actively exploited?

Yes. CVE-2026-39808 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 16 Jul 2026.

How severe is CVE-2026-39808?

CVE-2026-39808 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 47.4% probability of exploitation.

Which products are affected by CVE-2026-39808?

Affected products include Fortinet Fortisandbox.

How do I fix CVE-2026-39808?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39808 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.