CVE-2019-25371 OPNsense 19.1 Reflected XSS via diag_ping.php
Unauthenticated attackers can inject malicious scripts via the host parameter in diag_ping.php, leading to 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-2019-25371?
CVE-2019-25371 is a medium-severity cross-site scripting vulnerability in OPNsense, published on 15 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
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host parameter. Attackers can submit crafted POST requests to the diag_ping.php endpoint with script payloads in the host parameter to execute arbitrary JavaScript in users' browsers.
Weakness: CWE-79
Which versions are affected by CVE-2019-25371?
It affects 1 product.
Products include Opnsense Opnsense.
How do I fix CVE-2019-25371?
No fix has been published for CVE-2019-25371 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-2019-25371 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25371 exists.
Other vulnerabilities in OPNsense
Sources
Also known as GHSA-6rfq-gmm4-49p9.