CVE-2026-39808

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>

Overview

State: PUBLISHED
Assigner (CNA): fortinet
CVSS severity: CRITICAL
CVSS score: 9.1 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Effective score: 9.1 / 10 CRITICAL source: CNA overview
CWE(s): CWE-78
Reserved: 2026-04-07
Published: 2026-04-14 15:38 UTC
Last updated: 2026-04-22 13:56 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/39xxx/CVE-2026-39808.json
Linked Threat: CVE-2026-39808 — Fortinet FortiSandbox: Fortinet FortiSandbox OS Command Injection Vulnerability

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-04-14 16:16:44 UTC
NVD last modified: 2026-04-22 14:17:00 UTC
NVD CVSS v3.1: 9.8 / 10 CRITICAL source: psirt@fortinet.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.2545 (probability of exploitation in next 30 days)
EPSS percentile: 96.30% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-22338
Assigner: fortinet
Published: Apr 14, 2026, 3:38:02 PM
Updated: Apr 22, 2026, 1:56:10 PM
EUVD base score (CVSS 3.1): 9.1 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
EUVD-reported EPSS: 25.4500
Vendors: Fortinet
Products: FortiSandbox PaaS (21.4.4072)

FortiSandbox PaaS (21.3.4055)

FortiSandbox PaaS (22.2.4134)

FortiSandbox PaaS (23.3.4329)

FortiSandbox PaaS (23.4.4374)

FortiSandbox (4.4.0 ≤4.4.8)

FortiSandbox PaaS (22.2.4151)

FortiSandbox PaaS (22.1.4113)

FortiSandbox PaaS (23.1.4245)

FortiSandbox PaaS (23.4.4350)
Aliases: GHSA-wfjv-vrx5-2cf2

ENISA 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>

EUVD references (1)

https://fortiguard.fortinet.com/psirt/FG-IR-26-100

Affected products (2)

Vendor	Product	Versions	Platforms
Fortinet	FortiSandbox	`4.4.0` (affected)	—
Fortinet	FortiSandbox PaaS	`23.4.4374` (affected), `23.4.4350` (affected), `23.3.4329` (affected), `23.1.4245` (affected), `22.2.4151` (affected), `22.2.4134` (affected), `22.1.4113` (affected), `21.4.4072` (affected), `21.3.4055` (affected)	—

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:fortinet:fortisandbox:*:*:*:*:*:*:*:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://fortiguard.fortinet.com/psirt/FG-IR-26-100

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://fortiguard.fortinet.com/psirt/FG-IR-26-100

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (2)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://fortiguard.fortinet.com/psirt/FG-IR-26-100 psirt@fortinet.com Vendor Advisory
https://github.com/samu-delucas/CVE-2026-39808 134c704f-9b21-4f2e-91b3-4a467353bcc0

Indicators (2)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
cwe	`CWE-78`	no local data	2026-07-17 05:32 UTC
cve	`CVE-2026-39808`	no local data	2026-07-17 05:32 UTC

Remediations (11)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CISA Required Action

CISA KEV

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. Due date: 2026-07-19 Known ransomware campaign use: Unknown

2026-07-17 05:32 UTC
Fortinet Patches 11 Vulnerabilities Across FortiSandbox, FortiOS ...

web:cybersecuritynews.com

Fortinet released a sweeping batch of security advisories on April 14, 2026 , addressing 11 vulnerabilities spanning multiple product lines, including two rated Critical, two rated High, and seven rated Medium or Low.

2026-05-22 19:16 UTC
PoC Released for FortiSandbox Flaw Enabling Arbitrary ... - GBHackers

web:gbhackers.com

A proof-of-concept (PoC) exploit has been publicly released for a critical security flaw in Fortinet's FortiSandbox, CVE-2026-39808 .

2026-05-22 19:16 UTC
Nvd - Cve-2026-39808

web:nvd.nist.gov

Secure .gov websites use HTTPS A lock () or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

2026-05-22 19:16 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-22 19:16 UTC
Star Citizen Alpha 4.8 LIVE - Hotfix Central [Updated 5.21]

web:robertsspaceindustries.com

Hi Everyone! Time again for another Hotfix Central thread to keep you all up to date on things going on outside of the normal patch cycle in SC Alpha 4.8 LIVE! This will be a living document of...

2026-05-22 19:16 UTC
April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

2026-05-22 19:16 UTC
Fortinet fixes critical FortiSandbox vulnerabilities (CVE-2026-39813 ...

web:www.helpnetsecurity.com

Two vulnerabilities ( CVE - 2026 -39813, CVE-2026-39808 ) in FortiSandbox could be exploited by unauthenticated attackers via HTTP requests.

2026-05-22 19:16 UTC
CVE-2026-39808: Fortinet FortiSandbox RCE Vulnerability - SentinelOne

web:www.sentinelone.com

CVE-2026-39808 is an OS command injection vulnerability in Fortinet FortiSandbox. Learn about its impact, affected versions, and mitigation methods.

2026-05-22 19:16 UTC
CVE-2026-39808 - Vulnerability Details - OpenCVE

web:app.opencve.io

The vulnerability affects FortiSandbox versions 4.4.0 to 4.4.8 and FortiSandbox PaaS releases 21.3.4055 through 23.4.4374. Users deploying any of these builds must ensure they apply the latest patches.

2026-05-22 19:16 UTC
Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-05-22 19:16 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-39808.json.

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              "content": {
                "id": "CVE-2026-39808",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T03:55:32.291352Z",
                "version": "2.0.3"
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            "cpe:2.3:a:fortinet:fortisandboxpaas:21.4.4072:*:*:*:*:*:*:*",
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            },
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            },
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            "attackVector": "NETWORK",
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            "baseScore": 9.1,
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            "confidentialityImpact": "HIGH",
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