What is CVE-2025-54353?

CVE-2025-54353 is a medium-severity vulnerability in Fortinet Fortisandbox, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-12-09.

How severe is CVE-2025-54353?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Fortinet Fortisandbox

CVE-2025-54353

An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability [CWE-79] vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.2, FortiSandbox 4.4.0 through 4.4.7, FortiSandbox 4.2 all versions, For…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.054 (91.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

Fortinet Fortisandbox — versions 5.0.0, 4.4.0, 4.2.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

psirt@fortinet.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-54353?: CVE-2025-54353 is a medium-severity vulnerability in Fortinet Fortisandbox, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-12-09.
How severe is CVE-2025-54353?: Medium severity. CVSS v3 base score is 5.4 out of 10.