CVE-2019-25430 Comodo Dome Firewall 2.7.0 Reflected Cross-Site Scripting via vpn_users

Medium 5.1 Published 19 Feb 2026 Updated 24 May 2026

Unauthenticated attackers can inject malicious scripts via the username parameter in the vpn_users endpoint, executing arbitrary JavaScript 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-2019-25430?

CVE-2019-25430 is a medium-severity cross-site scripting vulnerability in Comodo Dome Firewall, published on 19 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

Comodo Dome Firewall 2.7.0 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by submitting crafted input to the username parameter. Attackers can send POST requests to the vpn_users endpoint with script payloads in the username field to execute arbitrary JavaScript in victim browsers.

Weakness: CWE-79

Which versions are affected by CVE-2019-25430?

It affects 1 product.

Products include Comodo Dome Firewall.

How do I fix CVE-2019-25430?

No fix has been published for CVE-2019-25430 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-2019-25430 being exploited?

There is no known exploitation of CVE-2019-25430 in the wild and no public exploit code.

Sources

Also known as GHSA-jmc4-f6rv-h5gr.