CVE-2026-39808
Fortinet FortiSandbox OS Command Injection Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 19 July 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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>
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 92.82% probability · 100th percentile
- CISA KEV
- Listed 16 July 2026 · due 19 July 2026
- Weakness
- CWE-78
- Affected
- fortinet/fortisandbox
- Source
- psirt@fortinet.com
CISA notes
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. https://fortiguard.fortinet.com/psirt/FG-IR-26-100 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-39808
References
- https://fortiguard.fortinet.com/psirt/FG-IR-26-100Vendor Advisory
- https://github.com/samu-delucas/CVE-2026-39808Exploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39808US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.