CVE-2026-39808

criticalpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.932 · 100 %ileexploit · PoCDEEUNLRUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV · 6 exploits · PoC

Likely / severe?

93.2% (100th) EPSS

CVSS 9.8 · critical

Is it mine?

17 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

added 2026-07-16remediate by 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.

EPSS · scored 2026-10-26

Fortinet FortiSandbox OS Command Injection Vulnerability

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

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:Csecondary · ENISA EU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · psirt@fortinet.comexploitability 3.9 · impact 5.9

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · NCSC-NL NL

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-78USCWE-78USCWE-78US

exploits (6)

Public proof-of-concept and weaponised exploit code.

0xBlackash/CVE-2026-39808CVE-2026-39808PoC · poc_in_github
Ghost-Bx1/Fortinet-Exploits-CVE-2026-39808-106173-107656PoC e Exploits completos para CVE-2026-39808 (FortiSandbox RCE), CVE-2026-106173 (FortiSIEM gRPC Path Traversal RCE) e CVE-2026-107656 (FortiSandbox Auth Bypass) - CVSS 9.6-9.8PoC · poc_in_github
HORKimhab/CVE-2026-39808CVE-2026-39808 - Fortinet Sandbox - DraftPoC · poc_in_github
error-inside/CVE-2026-39808Fortinet FortiSandbox 4.4.0-4.4.8 - OS Command Injection via tracer-behavior EndpointPoC · poc_in_github
samu-delucas/CVE-2026-39808PoC for Unauthenticated RCE in FortiSandbox via CVE-2026-39808PoC · poc_in_github
ynsmroztas/FortiSandbox-RCE-Exploit-CVE-2026-39808FortiSandbox RCE Scanner — CVE-2026-39808PoC · poc_in_github

affected products (17)

Products and version ranges known to be affected.

Fortinet FortiSandbox <4.4.9all versionscert_bundDE
Fortinet FortiSandbox< 4.4.9cert_bundDE
Fortinet FortiSandbox≤ 4.4.0 ≤4.4.8enisa_euvdEU
Fortinet FortiSandbox PaaS≤ 23.4.4350enisa_euvdEU
Fortinet FortiSandbox PaaS≤ 23.1.4245enisa_euvdEU
Fortinet FortiSandbox PaaS≤ 22.1.4113enisa_euvdEU
Fortinet FortiSandbox PaaS≤ 22.2.4151enisa_euvdEU
Fortinet FortiSandbox PaaS≤ 23.4.4374enisa_euvdEU
Fortinet FortiSandbox PaaS≤ 23.3.4329enisa_euvdEU
Fortinet FortiSandbox PaaS≤ 22.2.4134enisa_euvdEU
Fortinet FortiSandbox PaaS≤ 21.3.4055enisa_euvdEU
Fortinet FortiSandbox PaaS≤ 21.4.4072enisa_euvdEU
Fortinet Inc. FortiSandbox4.4.0 → 4.4.8fstec_bduRU
Fortinet FortiSandbox≤ vers:unknown/*ncsc_nlNL
Fortinet FortiSandbox Cloud≤ vers:unknown/*ncsc_nlNL
Fortinet FortiSandbox PaaS≤ vers:unknown/*ncsc_nlNL
fortinet fortisandbox4.4.0 → 4.4.9nvdUScpe:2.3:a:fortinet:fortisandbox:*:*:*:*:*:*:*:*

advisories (2)

Vendor and ecosystem advisories describing this.

NCSC-2026-0121Kwetsbaarheden verholpen in Fortinet FortiSandboxNL2026-04-15csaf · ncsc_nlNL
Fortinet heeft meerdere kwetsbaarheden verholpen in FortiSandbox, waaronder in on-premises versies en FortiSandbox Cloud, waarvan twee door Fortinet als kritiek zijn beoordeeld.
WID-SEC-W-2026-1094Fortinet FortiSandbox: Mehrere SchwachstellenDeutsch2026-04-14csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Fortinet FortiSandbox ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen, Informationen offenzulegen, Sicherheitsmaßnahmen zu umgehen und Code zur Ausführung zu bringen.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund ncsc_nl nvd NVD CVE.org MITRE

published 2026-04-14modified 2026-07-17

references (6)

External citations — patches, advisories, analysis.

https://access.redhat.com/security/cve/cve-2026-39808 cnnvd
https://fortiguard.fortinet.com/psirt/FG-IR-26-100 cnnvd
https://fortiguard.fortinet.com/psirt/FG-IR-26-100 enisa_euvd
https://fortiguard.fortinet.com/psirt/FG-IR-26-100Vendor Advisorynvd
https://github.com/samu-delucas/CVE-2026-39808ExploitThird Party Advisorynvd
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39808US Government Resourcenvd

scry

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