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5.1
OPNsense 19.1 Allows Malicious Script Injection via VPN Settings
CVE-2019-25374
Summary
OPNsense 19.1 has a security weakness that lets hackers inject malicious scripts into users' web browsers. This can happen when an attacker sends a specific type of request to the OPNsense web interface. To stay safe, update to a fixed version of OPNsense or apply the available patch.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| opnsense | opnsense | 19.1 | – |
Original title
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. A...
Original 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.
nvd CVSS3.1
6.1
nvd CVSS4.0
5.1
Vulnerability type
CWE-79
Cross-site Scripting (XSS)
- https://forum.opnsense.org/index.php?topic=11469.0 Release Notes
- https://opnsense.org Product
- https://www.exploit-db.com/exploits/46351 Exploit Third Party Advisory VDB Entry
- https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-vpnipsecsettings... Broken Link
Published: 15 Feb 2026 · Updated: 10 Mar 2026 · First seen: 6 Mar 2026