CVE-2019-25374
Unknown Unknown - Not Provided

Reflected XSS in OPNsense vpn_ipsec_settings.php Enables Code Execution

Publication date: 2026-02-15

Last updated on: 2026-02-18

Assigner: VulnCheck

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.

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Meta Information

Published
2026-02-15
Last Modified
2026-02-18
Generated
2026-07-06
AI Q&A
2026-02-15
EPSS Evaluated
2026-07-05
NVD
CVE-2019-25374
EUVD
EUVD-2019-19421

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
opnsense opnsense 19.1

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This vulnerability is a reflected cross-site scripting (XSS) issue in OPNsense 19.1. It occurs because the application does not properly sanitize the passthrough_networks parameter in the vpn_ipsec_settings.php page. Attackers can send specially crafted POST requests containing malicious JavaScript code in this parameter, which then gets executed in the browsers of users who access the affected page.

Impact Analysis

This vulnerability can allow attackers to execute arbitrary JavaScript code in the context of a user's browser. This can lead to theft of sensitive information such as session cookies, user credentials, or other data accessible through the browser. It may also enable attackers to perform actions on behalf of the user or deliver further malicious payloads.

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