CVE-2019-25371
Unknown Unknown - Not Provided

Reflected XSS in OPNsense diag_ping.php Allows Script Injection

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 unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host parameter. Attackers can submit crafted POST requests to the diag_ping.php endpoint with script payloads in the host parameter to execute arbitrary JavaScript 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-2019-25371
EUVD
EUVD-2019-19424

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 in OPNsense 19.1. It occurs because the application does not properly validate input in the 'host' parameter. An attacker can send specially crafted POST requests to the diag_ping.php endpoint with malicious script code embedded in the 'host' parameter. When a user interacts with this endpoint, the malicious JavaScript is executed in their browser.

Impact Analysis

This vulnerability can allow unauthenticated attackers to execute arbitrary JavaScript in the browsers of users interacting with the affected endpoint. This can lead to theft of sensitive information such as session cookies, user credentials, or other data accessible via the browser. It may also enable attackers to perform actions on behalf of the user or deliver further malicious payloads.

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