Check Point Advisories

Fortinet FortiSandbox Directory Traversal (CVE-2026-39813)

Vulnerability
Protection

Check Point Reference:	CPAI-2026-3372
Date Published:	27 Apr 2026
Severity:	High
Last Updated:	Monday 27 April, 2026
Source:
Industry Reference:	CVE-2026-39813
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Fortinet FortiSandbox 5.0.0 and later, prior to 5.0.6 Fortinet FortiSandbox 4.4.0 and later, prior to 4.4.9
Vulnerability Description	A directory traversal vulnerability in Fortinet FortiSandbox allows attackers to escalate privileges via a crafted path.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the Fortinet FortiSandbox Directory Traversal (CVE-2026-39813) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Application Servers Protection Violation.
Attack Information: Fortinet FortiSandbox Directory Traversal (CVE-2026-39813)