# 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.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **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 available:** No
- **Published:** 15 Feb 2026
- **Updated:** 24 May 2026
- **Also known as:** GHSA-prpr-jj7j-2v2f

## 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 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2019-25374?

It affects 1 product.


Products: 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.

## 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

- [CVE-2023-27152](https://insights.sbomify.com/CVE-2023-27152/): Auth bypass in n/a (critical 9.8)
- [CVE-2023-39001](https://insights.sbomify.com/CVE-2023-39001/): Command injection in n/a (critical 9.8)
- [CVE-2023-39004](https://insights.sbomify.com/CVE-2023-39004/): Information disclosure in n/a (critical 9.8)
- [CVE-2023-39008](https://insights.sbomify.com/CVE-2023-39008/): Command injection in n/a (critical 9.8)
- [CVE-2023-39007](https://insights.sbomify.com/CVE-2023-39007/): Cross-site scripting in n/a (critical 9.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-25374 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25374 exists.

Affected product: OPNsense. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-25374/ (Markdown: https://insights.sbomify.com/CVE-2019-25374/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-25374
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-25374
- OSV: https://osv.dev/vulnerability/CVE-2019-25374

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-25374/
Summaries are generated and may contain mistakes; the official description above is the record.