Critical [CVE-2026-39808] OS Command Injection through API endpoint
This critical-severity Fortinet advisory covers CVE-2026-39808 affecting FortiSandbox PaaS.
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Summary
CVSSv3 Score:
9.1
An Improper Neutralization of Special Elements used in an OS Command ('OS command injection') vulnerability [CWE-78] in FortiSandbox may allow an unauthenticated attacker to execute unauthorized code or commands via crafted HTTP requests.
Revised on 2026-04-14 00:00:00
Affected product named by the advisory: FortiSandbox PaaS.
CISA Known Exploited Vulnerability
- Listed:
- Jul 16, 2026 · federal remediation due Jul 19, 2026
- Required action:
- 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.
- Ransomware use:
- Unknown
KEV is a prioritization signal from CISA — remediation detail still comes from the vendor advisory.
- FortiSandbox 4.4: 4.4.0 through 4.4.8
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- FortiSandbox 4.4: 4.4.9
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Upgrade per the Affected/Solution table: FortiSandbox 4.4: 4.4.9.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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