CVE-2019-25377
Unknown Unknown - Not Provided
Reflected XSS in OPNsense system_advanced_sysctl.php Endpoint

Publication date: 2026-02-15

Last updated on: 2026-02-18

Assigner: VulnCheck

Description
OPNsense 19.1 contains a reflected cross-site scripting vulnerability in the system_advanced_sysctl.php endpoint that allows attackers to inject malicious scripts via the value parameter. Attackers can craft POST requests with script payloads in the value parameter to execute JavaScript in the context of authenticated user sessions.
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Meta Information
Published
2026-02-15
Last Modified
2026-02-18
Generated
2026-06-16
AI Q&A
2026-02-15
EPSS Evaluated
2026-06-14
NVD
CVE-2019-25377
EUVD
EUVD-2019-19419
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
opnsense opnsense 19.1
Helpful Resources
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 found in OPNsense 19.1, specifically in the system_advanced_sysctl.php endpoint.

Attackers can exploit this by sending specially crafted POST requests containing malicious script code in the 'value' parameter.

When an authenticated user interacts with this endpoint, the injected script executes in their browser context, potentially compromising their session.

Impact Analysis

This vulnerability can allow attackers to execute arbitrary JavaScript code within the context of authenticated user sessions.

Such execution can lead to theft of sensitive information, session hijacking, or performing unauthorized actions on behalf of the user.

Because the attack requires an authenticated user and user interaction, the risk is moderate but still significant.

Compliance Impact

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Detection Guidance

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