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CVE-2026-39808

Fortinet FortiSandbox•CRITICAL · CVSS 9.8• In the wild In CISA KEV

What is CVE-2026-39808?

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>

CVSS9.8 NVD 3.1

SeverityCRITICAL

Exploitation In the wild In CISA KEV

EPSS93% · P100

Triage statusActive Exploit

ActionPatch immediately

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWECWE-78

NVD published2026-04-14

NVD last modified2026-10-26

Timeline

2026-04-14Published to the U.S. National Vulnerability Database (NVD)
2026-06-17First covered in a defend.network daily briefing
2026-07-16Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
2026-07-19CISA federal remediation deadline (BOD 22-01)
2026-10-26NVD record last updated

CISA Known Exploited Vulnerability

Fortinet FortiSandbox OS Command Injection Vulnerability

Added to KEV2026-07-16

Federal patch deadline2026-07-19

Known ransomware useUnknown

Affected product

Fortinet FortiSandbox

Remediation Steps

Apply the vendor security update for Fortinet Fortisandbox as a priority.
Restrict network exposure of the affected service to trusted sources until patched.
Review logs and detections for indicators of exploitation.
Confirm fixed versions against the official vendor advisory before deploying.

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 2 of August 2026 (August 10 – 16)
Vulnerability Priority Report – Week 1 of August 2026 (August 3 – 9)
Vulnerability Priority Report – Week 4 of July 2026 (July 27 – August 2)
Vulnerability Priority Report – Week 3 of July 2026 (July 20 – 26)
Vulnerability Priority Report – Week 2 of July 2026 (July 13 – 19)
Vulnerability Priority Report – Week 3 of June 2026 (June 15 – 21)
WordPress, OpenSSL, Fortinet zero-days: patches shipped and KEV escalations (2026-07-18)
Fortinet actively exploited; Rokarolla targets 217 banking apps; Google Vertex AI flaw (2026-06-17)

Related vulnerabilities

CVE-2026-25089 – Fortinet FortiSandbox (same product)
CVE-2026-39813 – Fortinet Fortisandbox (same product)
CVE-2026-104286 – Fortinet FortiMail (same vendor)
CVE-2025-61624 – Fortinet Multiple Products (same vendor)
CVE-2026-35616 – Fortinet FortiClient EMS (same vendor)
CVE-2025-68686 – Fortinet FortiOS (same vendor)

Fortinet: 32 known exploited vulnerabilities (CISA KEV) →

Browse all tracked CVEs in the defend.network CVE database →

🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.