What is CVE-2025-61886?

CVE-2025-61886 is a medium-severity vulnerability in Fortinet Fortisandbox, classified under Cross-site Scripting. CVSS score: 4.9/10. Published 2026-04-14.

How severe is CVE-2025-61886?

Medium severity. CVSS v3 base score is 4.9 out of 10.

XSS in Fortinet Fortisandbox

CVE-2025-61886

An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability [CWE-79] vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.4, FortiSandbox PaaS 5.0.0 through 5.0.4 may allow an attacker to perfo…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (7.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C.

Affected products

Fortinet Fortisandbox — versions 5.0.0
Fortinet Fortisandbox Paas — versions 5.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-109

Frequently asked questions

What is CVE-2025-61886?: CVE-2025-61886 is a medium-severity vulnerability in Fortinet Fortisandbox, classified under Cross-site Scripting. CVSS score: 4.9/10. Published 2026-04-14.
How severe is CVE-2025-61886?: Medium severity. CVSS v3 base score is 4.9 out of 10.