Path traversal in FortiSandbox - CVE-2026-39813
Published: April 14, 2026
Vulnerability identifier: #VU125997
CSH Severity: Critical
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-39813
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication checks.
The vulnerability exists due to input validation error when processing directory traversal sequences. A remote non-authenticated attacker can send a specially crafted HTTP request to the JRPC API and bypass authentication process, leading to full system compromise.
Affected software
FortiSandbox
How to mitigate CVE-2026-39813
Install updates from vendor's website.
FortiSandbox - addressed in versions 4.4.9, 5.0.6