CVE-2019-25385 Smoothwall Express 3.1 'outgoing.cgi' Cross-Site Scripting

Medium 5.1 Published 16 Feb 2026 Updated 5 Mar 2026

Attackers can inject malicious scripts via the outgoing.cgi endpoint to steal session data from users of Smoothwall Express.

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-2019-25385?

CVE-2019-25385 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 attackers to inject malicious scripts by manipulating the MACHINE and MACHINECOMMENT parameters. Attackers can send POST requests to the outgoing.cgi endpoint with script payloads to execute arbitrary JavaScript in users' browsers and steal session data.

Weakness: CWE-79

Which versions are affected by CVE-2019-25385?

It affects 1 product.

Products include Smoothwall Smoothwall Express.

How do I fix CVE-2019-25385?

No fix has been published for CVE-2019-25385 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-2019-25385 being exploited?

There is no known exploitation of CVE-2019-25385 in the wild and no public exploit code.

Sources

Also known as GHSA-rp4q-m72m-rqhg.