What’s Vulnerable › Vulnerabilities

CVE-2019-25371: OPNsense 19.1 Reflected XSS via diag_ping.php

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-15 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• OPNsense: 19.1

References

• https://forum.opnsense.org/index.php?topic=11469.0
• https://opnsense.org
• https://www.exploit-db.com/exploits/46351
• https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-diagpingphp

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