CVE-2025-61886 Cross-site scripting in FortiSandbox

Medium 4.9 Published 14 Apr 2026 Updated 14 Apr 2026

An attacker can execute arbitrary scripts in the victim's browser via crafted HTTP requests in FortiSandbox, potentially compromising user sessions.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2025-61886?

CVE-2025-61886 is a medium-severity cross-site scripting vulnerability in Fortinet Fortisandbox, published on 14 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

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 perform an XSS attack via crafted HTTP requests.

Weakness: CWE-79

Which versions are affected by CVE-2025-61886?

It affects 2 products.

Products include Fortinet Fortisandbox, Fortinet Fortisandbox Cloud.

How do I fix CVE-2025-61886?

No fix has been published for CVE-2025-61886 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2025-61886 being exploited?

There is no known exploitation of CVE-2025-61886 in the wild and no public exploit code.

All Fortinet Fortisandbox vulnerabilities

Sources

Also known as GHSA-pr8g-5jxw-8fhj.