CVE-2019-25371

MEDIUM 6.1

OPNsense 19.1 Reflected XSS via diag_ping.php

CVSS Score

6.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	opnsense
Product	opnsense
Published	Feb 15, 2026
Last Updated	Mar 5, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

Opnsense / OPNsense

19.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Ozer Goker