CVE-2026-39813: Fortinet FortiSandbox

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

A path traversal: '../filedir' vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8 may allow attacker to escalation of privilege via specially crafted HTTP requests.

Affected products

• Fortinet FortiSandbox: from 4.4.0, before 4.4.9 (fixed in 4.4.9); from 5.0.0, before 5.0.6 (fixed in 5.0.6)

Published 2026-04-14. Last modified 2026-06-18.