CVE-2019-25390 Smoothwall Express 3.1 'interfaces.cgi' Cross-Site Scripting

Medium 4.8 Published 16 Feb 2026 Updated 5 Mar 2026

Attackers can inject malicious scripts via POST requests to interfaces.cgi, potentially hijacking administrator sessions in Smoothwall Express.

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

What is CVE-2019-25390?

CVE-2019-25390 is a medium-severity cross-site scripting vulnerability in Smoothwall Express, published on 16 Feb 2026. Any signed-in user can exploit it over the network, 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 interfaces.cgi script that allow attackers to inject malicious scripts through multiple parameters including GREEN_ADDRESS, GREEN_NETMASK, RED_DHCP_HOSTNAME, RED_ADDRESS, DNS1_OVERRIDE, DNS2_OVERRIDE, RED_MAC, RED_NETMASK, DEFAULT_GATEWAY, DNS1, and DNS2. Attackers can craft POST requests to interfaces.cgi with script payloads in these parameters to execute arbitrary JavaScript in the context of authenticated administrator sessions.

Weakness: CWE-79

Which versions are affected by CVE-2019-25390?

It affects 1 product.

Products include Smoothwall Smoothwall Express.

How do I fix CVE-2019-25390?

No fix has been published for CVE-2019-25390 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-2019-25390 being exploited?

There is no known exploitation of CVE-2019-25390 in the wild and no public exploit code.

Sources

Also known as GHSA-5h2c-v9pg-pf7w.