CVE-2019-25393 Smoothwall Express 3.1 'smoothinfo.cgi' Cross-Site Scripting

Medium 5.1 Published 16 Feb 2026 Updated 5 Mar 2026

Unauthenticated attackers can inject malicious scripts via the smoothinfo.cgi endpoint, allowing arbitrary JavaScript execution in victim 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-2019-25393?

CVE-2019-25393 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 a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation. Attackers can submit POST requests to the smoothinfo.cgi endpoint with script payloads in the WRAP or SECTIONTITLE parameters to execute arbitrary JavaScript in victim browsers.

Weakness: CWE-79

Which versions are affected by CVE-2019-25393?

It affects 1 product.

Products include Smoothwall Smoothwall Express.

How do I fix CVE-2019-25393?

No fix has been published for CVE-2019-25393 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-2019-25393 being exploited?

There is no known exploitation of CVE-2019-25393 in the wild and no public exploit code.

Sources

Also known as GHSA-xxhc-j59w-qj54.