What is CVE-2026-25691?

CVE-2026-25691 is a medium-severity vulnerability in Fortinet Fortisandbox, classified under Path Traversal. CVSS score: 6.7/10. Published 2026-04-14.

How severe is CVE-2026-25691?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Path Traversal in Fortinet Fortisandbox

CVE-2026-25691

A improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox 4.2 all versions, FortiSandbox Cloud 5.0.4, FortiSa…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.005 (36.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H.

Affected products

Fortinet Fortisandbox — versions 5.0.0, 4.4.0, 4.2.1
Fortinet Fortisandbox Cloud — versions 5.0.4
Fortinet Fortisandbox_cloud — versions 5.0.4
Fortinet Fortisandbox Paas — versions 5.0.4

Weakness classification (CWE)

CWE-22 — Path Traversal

References

psirt@fortinet.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-25691?: CVE-2026-25691 is a medium-severity vulnerability in Fortinet Fortisandbox, classified under Path Traversal. CVSS score: 6.7/10. Published 2026-04-14.
How severe is CVE-2026-25691?: Medium severity. CVSS v3 base score is 6.7 out of 10.