CVE-2019-25383 Smoothwall Express 3.1 'apcupsd.cgi' Cross-Site Scripting

Medium 5.1 Published 16 Feb 2026 Updated 5 Mar 2026

Attackers can inject malicious JavaScript into victim browsers via crafted POST requests to the apcupsd.cgi script in 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-2019-25383?

CVE-2019-25383 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 apcupsd.cgi script that allow attackers to inject malicious scripts through multiple POST parameters. Attackers can submit crafted POST requests with script payloads in parameters like BATTLEVEL, RTMIN, BATTDELAY, TO, ANNOY, UPSIP, UPSNAME, UPSPORT, POLLTIME, UPSUSER, NISPORT, UPSAUTH, EMAIL, FROM, CC, SMSEMAIL, SMTPSERVER, PORT, USER, and EMAIL_PASSWORD to execute arbitrary JavaScript in victim browsers.

Weakness: CWE-79

Which versions are affected by CVE-2019-25383?

It affects 1 product.

Products include Smoothwall Smoothwall Express.

How do I fix CVE-2019-25383?

No fix has been published for CVE-2019-25383 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-2019-25383 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25383 exists.

Sources

Also known as GHSA-hqvf-34x3-wr3f.