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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-07-16
• EPSS: 76.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-09 · updated 2026-07-23
• Weakness: CWE-78

Description

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 through 4.2.8; from 4.4.0 before 4.4.9; from 5.0.0 before 5.0.6 — fixed in 4.4.9, 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

How to fix

Upgrade to a fixed version: Fortinet FortiSandbox 4.4.9, 5.0.6; Fortinet FortiSandbox Cloud 5.0.6; Fortinet FortiSandbox PaaS 5.0.6. Check the vendor advisory for mitigations.

References

• https://fortiguard.fortinet.com/psirt/FG-IR-26-141
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-25089

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