Skip to content
Patcharo
Back to the results

Vulnerabilities

CriticalKEV

CVE-2026-39808 — Fortinet FortiSandbox OS Command Injection Vulnerability

CVE-2026-39808 · FortiSandbox · CVSS 9.8 · KEV

In brief

Severity · CVSS
Critical9.8CVSS 3.1, Critical
EPSS
47%
CISA KEV
Known exploited, listed since 16 Jul 2026
Vendor
Fortinet
Products
FortiSandbox
Published · Modified
·
Last verified

Summary

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>

Weakness: CWE-78

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

1 branch with a published fixed release · 7 branches without a precise fixed release

Fortinet FortiSandbox

Source: FG-IR-26-100CVE-2026-39808

  1. 5.0
    Affected versionsNot affected
    First fixed release—
  2. 4.4
    Affected versions4.4.0 – 4.4.8
    First fixed release4.4.9

Releases the vendor does not list are not affected.

Fortinet FortiSandbox PaaS

Source: CVE-2026-39808

  1. 23.4
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  2. 23.3
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  3. 23.1
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  4. 22.2
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  5. 22.1
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  6. 21.4
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  7. 21.3
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed

No precise fixed release is published for this product in the sources Patcharo follows.

Releases the vendor does not list are not affected.

Remediation

Fix available

Vendor fix

  • FortiSandbox 4.44.4.9

Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.

Upgrade to FortiSandbox version 4.4.9 or above Upgrade to FortiSandbox PaaS version 5.0.2 or above

SourceFortinet (CVE record)

SourceFortiGuard FG-IR-26-100

CISA KEV 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).

Full CISA action

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.

CISA due date:

SourceCISA KEV

CERT-FR recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

SourceCERTFR-2026-AVI-0440

Last verified 1 Oct 2026 at 09:31 UTC

Known exploitation

Added to CISA KEV on 16 Jul 2026

Federal remediation due date: 19 Jul 2026

The CISA required action is shown under Remediation.

47% probability of exploitation in the next 30 days (percentile 99%).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CERT-FR

1 document of the French national CERT (ANSSI) references this CVE.

Advisory (AVI)CERTFR-2026-AVI-0440Published 15 Apr 2026

Multiple vulnerabilities in Fortinet products

Remote arbitrary code executionPrivilege escalationRemote denial of serviceData confidentiality breachData integrity breachSecurity policy bypassRemote cross-site scripting (XSS)Not specified by the vendorServer-side request forgery (SSRF)SQL injection (SQLi)

Summary

Multiple vulnerabilities have been discovered in Fortinet products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation, and remote denial of service. Fortinet indicates that the CVE-2025-61624 vulnerability is actively exploited.

Recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

Official document on cert.ssi.gouv.frread by Patcharo 28 Sept 2026 at 20:03 UTCMachine translation of the French text published by CERT-FR; a text whose translation did not pass Patcharo's checks stays in French. Identifiers, versions and links are copied unchanged.

Timeline

  1. Published by the source
  2. Added to CISA KEV
  3. Source record last modified
  4. CISA remediation due date
  5. EPSS score computed
  6. Last verified by Patcharo

Official sources

References

Known exploited

Fortinet · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · FortiGuard FG-IR-26-100

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: FortiOS version numbering: branches, patch releases and the Feature and Mature labels

Related vulnerabilities

Other records affecting the same products, newest first.

  • CVE-2026-25089Fortinet FortiSandbox OS Command Injection VulnerabilityCriticalKEV

All FortiSandbox vulnerabilitiesAll Fortinet vulnerabilities