FortiSandbox Flaw Allows OS Command Injection and Remote Code Execution

A newly disclosed vulnerability in Fortinet’s FortiSandbox platform could allow attackers to execute arbitrary commands and run unauthorised code on affected systems, posing a serious risk to organisations relying on the product for advanced threat detection and analysis.

Tracked as CVE-2025-53949, the flaw is classified as an Improper Neutralization of Special Elements used in an OS Command (OS Command Injection) [CWE-78]. The issue resides in the GUI component of FortiSandbox.

It stems from insufficient validation of user-supplied input in specific HTTP requests.

When exploited, an authenticated attacker can inject malicious commands that are executed by the underlying operating system, potentially leading to complete compromise of the appliance.

Fortinet has rated the vulnerability as High severity, assigning it a CVSS v3.1 score of 7.0.

Successful exploitation could enable an attacker to execute unauthorized code or commands, thereby impacting the confidentiality, integrity, and availability of the system.

However, exploitation requires authentication, which may reduce the likelihood of opportunistic attacks but still presents a serious risk in environments where credentials are exposed, shared, or compromised.

Fortinet urges customers to upgrade to the fixed releases or migrate to a secure version as soon as possible to mitigate potential exploitation.

Organizations should also review administrative access to FortiSandbox, enforce strong authentication practices, and monitor logs for suspicious activity or unexpected command execution originating from the appliance.

The vulnerability was reported under responsible disclosure by Jason McFadyen of Trend Research, working with the Trend Micro Zero Day Initiative.

Fortinet published the advisory under incident reference FG-IR-25-479 on December 9, 2025, along with CVRF and CSAF packages to assist organizations in automated vulnerability management and compliance tracking.

Given FortiSandbox’s role in analyzing potentially malicious files and detecting advanced threats, administrators are strongly advised to prioritize patching to ensure that a system designed to protect the network does not become a pivot point for attackers.

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