CVE-2026-39808: critical vulnerability in Fortinet FortiSandbox
Published · Updated
Patch now. It under exploitation confirmed by CISA and has a working public exploit.
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.
FortiSandbox versions 4.4.0 to 4.4.8 have a critical flaw that allows attackers to run unauthorized commands on the system. This happens because special characters in user input are not properly filtered before being used in system commands.
An OS command injection vulnerability (CWE-78) exists due to improper neutralization of special elements in command execution. An attacker can craft malicious input to break out of the intended command context and execute arbitrary system commands, potentially achieving full system compromise with the privileges of the FortiSandbox process.
The full analysis of this CVE is available in Portuguese →
In the same product, most dangerous first.