CVE-2019-25371: Opnsense

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Opnsense Opnsense: version 19.1 only

Published 2026-02-15. Last modified 2026-06-17.