CVE-2026-39808
Fortinet FortiSandbox OS Command Injection Vulnerability - [Actively Exploited]
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>
INFO
Published Date :
April 14, 2026, 4:16 p.m.
Last Modified :
July 17, 2026, 5:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
Fortinet FortiSandbox contains an OS command injection vulnerability that could allow an unauthenticated attacker to execute unauthorized code or commands via crafted HTTP requests.
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.
Unknown
https://fortiguard.fortinet.com/psirt/FG-IR-26-100 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-39808
Affected Products
The following products are affected by CVE-2026-39808
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | 6abe59d8-c742-4dff-8ce8-9b0ca1073da8 | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update FortiSandbox to a patched version.
- Apply vendor security patches promptly.
- Validate system configuration.
Public PoC/Exploit Available at Github
CVE-2026-39808 has a 15 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-39808.
| URL | Resource |
|---|---|
| https://fortiguard.fortinet.com/psirt/FG-IR-26-100 | Vendor Advisory |
| https://github.com/samu-delucas/CVE-2026-39808 | Exploit Third Party Advisory |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39808 | US Government Resource |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-39808 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-39808
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Fortinet FortiSandbox 4.4.0-4.4.8 - OS Command Injection via tracer-behavior Endpoint
Python
CVE-2026-39808 - Fortinet Sandbox - Draft
信息安全综合实验（自动化CVE漏洞监控和AI分析系统）
Python HTML
Automated daily recon for everything new in cybersecurity. Scans 50+ sources every 24 hours.
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FortiSandbox RCE Scanner — CVE-2026-39808
Python
CVE-2026-39808
Python
PoC for Unauthenticated RCE in FortiSandbox via CVE-2026-39808
cve fortinet fortisandbox poc cve-2026-39808 cve-poc
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (CWE-78)
Security Tracker
Python
Panel de ciberamenazas que se actualiza solo: nuevas amenazas y vulnerabilidades activas cada 6 horas.
CSS Python HTML JavaScript
CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild and CryptoGen Nepal aims to simplify this for the general public in a more understandable way as well as in a format that can be easily integrated into their threat intelligence systems.
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Python HTML
This project involves developing an object detection system using Arduino, Raspberry Pi 4, and the YOLOv4 model. The primary goal is to evaluate the performance and efficiency of Arduino and Raspberry Pi 4 hardware in handling object detection tasks.
Python
The difference between exploitation prediction and detection is akin to the difference between detecting a missile launch or a detonation. Every avoided exploitation cycle saves hundreds of hours of engineering and infosec time.
Jupyter Notebook Python PowerShell
None
Python
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-39808 vulnerability anywhere in the article.
-
security.nl
VS meldt voor het eerst misbruik van Fortinet FortiSandbox-lekken
Aanvallers maken actief misbruik van twee kritieke kwetsbaarheden in Fortinet FortiSandbox en dat is voor het eerst, aldus het Amerikaanse cyberagentschap CISA. De Fortinet FortiSandbox is een server ... Read more
-
The Hacker News
CISA Adds Exploited SharePoint RCE Zero-Day CVE-2026-58644 to KEV
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Thursday added a newly patched security flaw impacting Microsoft SharePoint Server to its Known Exploited Vulnerabilities (KEV) cata ... Read more
-
The Hacker News
Attackers Exploit Three Fortinet FortiSandbox Flaws, One Patched Last Week
Bad actors are exploiting multiple security vulnerabilities in Fortinet FortiSandbox, according to threat intelligence firm Defused Cyber. In a post shared on X, the company said it has observed explo ... Read more
-
security.nl
'Kritiek lek in Fortinet FortiSandbox na aantal dagen al misbruikt bij aanvallen'
Een kritieke kwetsbaarheid in Fortinet FortiSandbox is een aantal dagen na de bekendmaking al misbruikt bij aanvallen, zo meldt securitybedrijf Defused. Fortinet kwam op 9 juni met beveiligingsupdates ... Read more
-
Daily CyberSecurity
Critical RCE Alert: Bamboo Data Center Vulnerable to OS Command Injection
Atlassian has issued a high-priority advisory for its Bamboo Data Center users, detailing a critical-severity security flaw that could allow attackers to take full control of affected servers. The vul ... Read more
-
Daily CyberSecurity
MOVEit WAF Critical Alert: Multi-Level RCE and WAF Bypass Vulnerabilities Disclosed
Progress Software has released a critical security bulletin for April 2026, revealing five high-impact vulnerabilities affecting MOVEit WAF and related Application Delivery Controller (ADC) products. ... Read more
-
Daily CyberSecurity
Progress Kemp LoadMaster Alert: Multiple RCE and WAF Bypass Flaws Patched
The Progress Kemp LoadMaster team has confirmed a significant security event involving five high-severity vulnerabilities affecting its application delivery controllers. These flaws, which impact both ... Read more
-
Daily CyberSecurity
Root Access Unlocked: FortiSandbox CVE-2026-39808 Details and PoC Exploit Publicly Disclosed
Image: Samuel de Lucas Maroto A critical vulnerability in FortiSandbox has been disclosured. The flaw, tracked as CVE-2026-39808, carries a devastating CVSS score of 9.1, allowing unauthenticated atta ... Read more
-
Help Net Security
Week in review: Acrobat Reader flaw exploited, Claude Mythos offensive capabilities and limits
Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: Bringing governance and visibility to machine and AI identities In this Help Net Security interview, A ... Read more
-
CybersecurityNews
PoC Exploit Released for FortiSandbox Vulnerability that Allows Attacker to Execute Commands
A proof-of-concept (PoC) exploit has been publicly released for a critical vulnerability in Fortinet’s FortiSandbox product, tracked as CVE-2026-39808. The flaw allows an unauthenticated attacker to e ... Read more
-
Help Net Security
Researcher drops two more Microsoft Defender zero-days, all three now exploited in the wild
The security researcher who earlier this month published a proof-of-concept (PoC) exploit for a zero-day privilege escalation vulnerability in Microsoft Defender is back with two more. The first, dubb ... Read more
-
TheCyberThrone
Fortinet FortiSandbox — Critical Vulnerability Advisory
April 16, 2026Fortinet published a sweeping security advisory on April 14, 2026, disclosing multiple vulnerabilities across its FortiSandbox platform. Two of the flaws are rated Critical with unauthen ... Read more
-
Help Net Security
Fortinet fixes critical FortiSandbox vulnerabilities (CVE-2026-39813, CVE-2026-39808)
Two vulnerabilities (CVE-2026-39813, CVE-2026-39808) in FortiSandbox could be leveraged by unauthenticated attackers to bypass authentication and execute unauthorized code or commands on vulnerable sy ... Read more
-
The Register
Patch these critical Fortinet sandbox bugs that let attackers bypass login, run commands over HTTP
Watch out for more Fortinet vulns! Two critical bugs in Fortinet's sandbox could allow unauthenticated attackers to bypass authentication or execute unauthorized code on vulnerable systems. Luckily, t ... Read more
-
The Hacker News
April Patch Tuesday Fixes Critical Flaws Across SAP, Adobe, Microsoft, Fortinet, and More
A number of critical vulnerabilities impacting products from Adobe, Fortinet, Microsoft, and SAP have taken center stage in April's Patch Tuesday releases. Topping the list is an SQL injection vulnera ... Read more
-
Daily CyberSecurity
Adobe Rushes Patches for Critical ColdFusion RCE and Security Bypasses
Adobe has released an urgent set of security updates to address multiple vulnerabilities within its ColdFusion 2025 and 2023 versions. The patches resolve a range of critical and moderate security gap ... Read more
-
Daily CyberSecurity
Critical 9.1 Flaws Hit Fortinet FortiSandbox
Fortinet has issued an urgent advisory regarding two critical vulnerabilities in its FortiSandbox platform—vulnerabilities that could allow unauthenticated attackers to bypass security entirely and se ... Read more
-
Daily CyberSecurity
Active SharePoint Spoofing and Legacy Office RCE: CISA Alerts on New KEV Exploits
The Cybersecurity and Infrastructure Security Agency (CISA) has expanded its Known Exploited Vulnerabilities (KEV) Catalog, sounding a fresh warning about two high-risk security flaws currently being ... Read more
-
CybersecurityNews
Fortinet Patches 11 Vulnerabilities Across FortiSandbox, FortiOS, FortiAnalyzer, and FortiManager
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 rate ... Read more
-
CybersecurityNews
Critical FortiSandbox Vulnerabilities Allow Attackers to Execute Unauthorized Commands
Fortinet has disclosed two critical security vulnerabilities affecting its FortiSandbox platform, both carrying a CVSSv3 score of 9.1. The flaws, published on April 14, 2026, could allow unauthenticat ... Read more
The following table lists the changes that have been made to the
CVE-2026-39808 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 17, 2026
Action Type Old Value New Value Changed SSVC {'id': 'CVE-2026-39808', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-16T17:45:11.106860Z'} {'id': 'CVE-2026-39808', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-04-14T00:00:00+00:00'} -
Modified Analysis by [email protected]
Jul. 16, 2026
Action Type Old Value New Value Added Reference Type CISA-ADP: https://github.com/samu-delucas/CVE-2026-39808 Types: Exploit, Third Party Advisory Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39808 Types: US Government Resource -
CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725
Jul. 16, 2026
Action Type Old Value New Value Added Date Added 2026-07-16 Added Due Date 2026-07-16 Added Required Action 2026-07-16 Added Vulnerability Name 2026-07-16 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 16, 2026
Action Type Old Value New Value Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39808 Changed SSVC {'id': 'CVE-2026-39808', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-04-22T03:55:32.291352Z'} {'id': 'CVE-2026-39808', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-16T17:45:11.106860Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-39808', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-04-22T03:55:32.291352Z'} -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:2.3:a:fortinet:fortisandbox:4.4.8:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandbox:4.4.7:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandbox:4.4.6:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandbox:4.4.5:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandbox:4.4.4:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandbox:4.4.3:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandbox:4.4.2:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandbox:4.4.1:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandbox:4.4.0:*:*:*:*:*:*:*'], 'vendor': 'Fortinet', 'product': 'FortiSandbox', 'versions': [{'status': 'affected', 'version': '4.4.0', 'versionType': 'semver', 'lessThanOrEqual': '4.4.8'}], 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:2.3:a:fortinet:fortisandboxpaas:23.4.4374:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandboxpaas:23.4.4350:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandboxpaas:23.3.4329:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandboxpaas:23.1.4245:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandboxpaas:22.2.4151:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandboxpaas:22.2.4134:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandboxpaas:22.1.4113:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandboxpaas:21.4.4072:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortisandboxpaas:21.3.4055:*:*:*:*:*:*:*'], 'vendor': 'Fortinet', 'product': 'FortiSandbox PaaS', 'versions': [{'status': 'affected', 'version': '23.4.4374'}, {'status': 'affected', 'version': '23.4.4350'}, {'status': 'affected', 'version': '23.3.4329'}, {'status': 'affected', 'version': '23.1.4245'}, {'status': 'affected', 'version': '22.2.4151'}, {'status': 'affected', 'version': '22.2.4134'}, {'status': 'affected', 'version': '22.1.4113'}, {'status': 'affected', 'version': '21.4.4072'}, {'status': 'affected', 'version': '21.3.4055'}], 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 22, 2026
Action Type Old Value New Value Added Reference https://github.com/samu-delucas/CVE-2026-39808 -
Initial Analysis by [email protected]
Apr. 20, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:fortinet:fortisandbox:*:*:*:*:*:*:*:* versions from (including) 4.4.0 up to (including) 4.4.9 Added Reference Type Fortinet, Inc.: https://fortiguard.fortinet.com/psirt/FG-IR-26-100 Types: Vendor Advisory -
New CVE Received by [email protected]
Apr. 14, 2026
Action Type Old Value New Value Added 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> Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-78 Added Reference https://fortiguard.fortinet.com/psirt/FG-IR-26-100