CVE-2019-25369
Unknown Unknown - Not Provided

Stored XSS in OPNsense sysctl Endpoint Enables Persistent Script Injection

Publication date: 2026-02-15

Last updated on: 2026-02-18

Assigner: VulnCheck

Description
OPNsense 19.1 contains a stored cross-site scripting vulnerability in the system_advanced_sysctl.php endpoint that allows attackers to inject persistent malicious scripts via the tunable parameter. Attackers can submit POST requests with script payloads that are stored and executed in the context of authenticated user sessions when the page is viewed.

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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
2026-07-04
NVD
CVE-2019-25369
EUVD
EUVD-2019-19426

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 stored cross-site scripting (XSS) issue in OPNsense 19.1, specifically in the system_advanced_sysctl.php endpoint. It allows attackers to inject malicious scripts persistently via the tunable parameter. These scripts are stored on the server and executed in the context of authenticated user sessions when the affected page is viewed.

Impact Analysis

The impact of this vulnerability is that attackers can execute malicious scripts within authenticated user sessions. This can lead to unauthorized actions performed on behalf of the user, theft of sensitive information, session hijacking, or other malicious activities that compromise the security and integrity of the affected system.

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