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CVE-2019-25371

OPNsense 19.1 Reflected XSS via diag_ping.php

Published: Feb 15, 2026Updated: Feb 18, 2026 Sources: CVE List NVDCWE-79
NVD MITRE
6.1CVSSMEDIUM
EPSS Score
0.2%
Top 85.1%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

opnsenseopnsense
On-prem
Networking Infrastructure / firewall
OPNsenseOpnsense
On-prem
Networking Infrastructure / firewall
opnsenseoss-projectNetworking Infrastructure

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://forum.opnsense.org/index.php?topic=11469.0
forum.opnsense.org
https://opnsense.org
opnsense.org
https://www.exploit-db.com/exploits/46351
exploit-db.com
and 1 more references View all →

Timeline

Published
Feb 15, 2026
Last Updated
Feb 18, 2026

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