What is CVE-2025-52436?

CVE-2025-52436 is a high-severity vulnerability in Fortinet Fortisandbox, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-02-10.

How severe is CVE-2025-52436?

High severity. CVSS v3 base score is 8.8 out of 10.

XSS in Fortinet Fortisandbox

CVE-2025-52436

An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability [CWE-79] vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.1, FortiSandbox 4.4.0 through 4.4.7, FortiSandbox 4.2 all versions, FortiSandbox 4.0 all versions may allow an unauthenticated attacker to execute commands via crafted requests.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.063 (93.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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-2025-52436?: CVE-2025-52436 is a high-severity vulnerability in Fortinet Fortisandbox, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-02-10.
How severe is CVE-2025-52436?: High severity. CVSS v3 base score is 8.8 out of 10.