CVE-2019-25381 Smoothwall Express 3.1 'hosts.cgi' Cross-Site Scripting

Medium 5.1 Published 16 Feb 2026 Updated 5 Mar 2026

Attackers can inject malicious scripts via unvalidated parameters in hosts.cgi, allowing arbitrary JavaScript execution in users' browsers.

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-2019-25381?

CVE-2019-25381 is a medium-severity cross-site scripting vulnerability in Smoothwall Express, published on 16 Feb 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

Smoothwall Express 3.1-SP4-polar-x86_64-update9 contains multiple reflected cross-site scripting vulnerabilities in the hosts.cgi script that allow attackers to inject malicious scripts through unvalidated parameters. Attackers can submit POST requests to the hosts.cgi endpoint with script payloads in the IP, HOSTNAME, or COMMENT parameters to execute arbitrary JavaScript in users' browsers.

Weakness: CWE-79

Which versions are affected by CVE-2019-25381?

It affects 1 product.

Products include Smoothwall Smoothwall Express.

How do I fix CVE-2019-25381?

No fix has been published for CVE-2019-25381 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-2019-25381 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25381 exists.

Sources

Also known as GHSA-64x3-m8qv-57vg.