CVE-2019-25374 OPNsense 19.1 Reflected XSS via vpn_ipsec_settings.php
Attackers can inject malicious scripts via the passthrough_networks parameter in OPNsense, potentially executing code in users' 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-2019-25374?
CVE-2019-25374 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 attackers to inject malicious scripts by exploiting the passthrough_networks parameter in vpn_ipsec_settings.php. Attackers can craft POST requests with JavaScript payloads in the passthrough_networks parameter to execute arbitrary code in users' browsers.
Weakness: CWE-79
Which versions are affected by CVE-2019-25374?
It affects 1 product.
Products include Opnsense Opnsense.
How do I fix CVE-2019-25374?
No fix has been published for CVE-2019-25374 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-2019-25374 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25374 exists.
Other vulnerabilities in OPNsense
Sources
Also known as GHSA-prpr-jj7j-2v2f.