Fortinet · FortiSandbox
CVE-2026-39808
Fortinet FortiSandbox OS Command Injection Vulnerability
What it is
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>
CISA: Fortinet FortiSandbox contains an OS command injection vulnerability that could allow an unauthenticated attacker to execute unauthorized code or commands via crafted HTTP requests.
What to do
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.
Deadline for US federal agencies: July 19, 2026
- Added to the CISA list
- July 16, 2026
- Published
- April 14, 2026
- Severity
- Critical 9.1 CVSS 3.1
- Chance of attacks in the next 30 days (EPSS)
- 93% in the top 0.2% of all known vulnerabilities
- Weakness
- CWE-78
- More details
- NVD · CVE.org · CISA
All references (1)
More exploited flaws from Fortinet
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Jul 16, 2026 | OS Command Injection | FortiSandbox | Critical 9.1 | 76% |
| Oct 16, 2026 | Path Traversal | Multiple Products | Medium 5.4 | 1.3% |
| Oct 1, 2026 | Path Traversal | FortiMail | Critical 9.8 | 4.6% |
| Sep 9, 2026 | Heap-based Buffer Overflow | Multiple Products | High 7.4 | 3.7% |
| Jul 27, 2026 | Exposure of Sensitive Information to an Unauthorized Actor | FortiOS | Medium 5.3 | 29% |
| Apr 13, 2026 | SQL Injection | FortiClient EMS | Critical 9.1 | 98% |
| Apr 6, 2026 | Improper Access Control | FortiClient EMS | Critical 9.1 | 94% |
| Jan 27, 2026 | Authentication Bypass Using an Alternate Path or Channel | Multiple Products | Critical 9.4 | 87% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.