What is CVE-2018-1356?

CVE-2018-1356 is a medium-severity vulnerability in Fortinet Fortisandbox, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-04-09.

How severe is CVE-2018-1356?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Fortinet Fortisandbox

CVE-2018-1356

A reflected Cross-Site-Scripting (XSS) vulnerability in Fortinet FortiSandbox before 3.0 may allow an attacker to execute unauthorized code or commands via the back_url parameter in the file scan component.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-04-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (58.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Fortinet Fortisandbox — versions 2.4.0, 2.5.2, 2.5.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

fortiguard.com/advisory/FG-IR-18-024 (Vendor Advisory)
www.securityfocus.com/bid/107838 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-1356?: CVE-2018-1356 is a medium-severity vulnerability in Fortinet Fortisandbox, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-04-09.
How severe is CVE-2018-1356?: Medium severity. CVSS v3 base score is 6.1 out of 10.