CVE-2026-25089: Fortinet FortiSandbox OS Command Injection Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2026-07-16. EPSS: 76.1% chance of exploitation in the next 30 days.

A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox 4.2 all versions, FortiSandbox Cloud 5.0.4 through 5.0.5, FortiSandbox PaaS 5.0.4 through 5.0.5 may allow an unauthenticated attacker to execute unauthorized commands via specifically crafted HTTP requests

Affected products

• Fortinet FortiSandbox: from 4.2.0, up to and including 4.2.8; from 4.4.0, before 4.4.9 (fixed in 4.4.9); from 5.0.0, before 5.0.6 (fixed in 5.0.6)
• Fortinet FortiSandbox Cloud: from 5.0.4, before 5.0.6 (fixed in 5.0.6)
• Fortinet FortiSandbox Paas: from 5.0.4, before 5.0.6 (fixed in 5.0.6)

Published 2026-06-09. Last modified 2026-07-23.