CVE-2026-39808
Fortinet FortiSandbox OS Command Injection
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 :
April 14, 2026, 4:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
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 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 2 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 |
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).
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)
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.
-
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
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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
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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
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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
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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
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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
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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
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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
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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.
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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