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.
Published: 2026-02-15
Score: 5.1 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Solution

OPNsense 19.1.1 released

Tracking

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Advisories

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History

Wed, 18 Feb 2026 19:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:opnsense:opnsense:19.1:*:*:*:*:*:*:*

Tue, 17 Feb 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sun, 15 Feb 2026 14:15:00 +0000

Type Values Removed Values Added
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.
Title OPNsense 19.1 Reflected XSS via diag_ping.php
First Time appeared Opnsense
Opnsense opnsense
Weaknesses CWE-79
CPEs cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:*
Vendors & Products Opnsense
Opnsense opnsense
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N'}


Subscriptions

Opnsense Opnsense
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-03-05T01:26:18.758Z

Reserved: 2026-02-15T13:20:10.666Z

Link: CVE-2019-25371

cve-icon Vulnrichment

Updated: 2026-02-17T17:25:10.432Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-15T14:16:06.723

Modified: 2026-02-18T19:14:24.603

Link: CVE-2019-25371

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-16T09:42:58Z

Weaknesses