CVE-2019-25376 OPNsense 19.1 Reflected XSS via proxy endpoint
Unauthenticated attackers can inject malicious scripts via the ignoreLogACL parameter, potentially compromising user sessions and data.
- 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-2019-25376?
CVE-2019-25376 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 submitting crafted payloads through the ignoreLogACL parameter. Attackers can send POST requests to the proxy endpoint with JavaScript code in the ignoreLogACL parameter to execute arbitrary scripts in users' browsers.
Weakness: CWE-79
Which versions are affected by CVE-2019-25376?
It affects 1 product.
Products include Opnsense Opnsense.
How do I fix CVE-2019-25376?
No fix has been published for CVE-2019-25376 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-2019-25376 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25376 exists.
Other vulnerabilities in OPNsense
Sources
Also known as GHSA-2444-5vx9-4q2f.