Reflected Cross-Site Scripting Vulnerability in OPNsense by Deciso
CVE-2019-25371

5.1MEDIUM

Key Information:

Vendor

Opnsense

Status
Opnsense
Vendor
CVE Published:
15 February 2026

Badges

👾 Exploit Exists

What is CVE-2019-25371?

OPNsense versions prior to 19.1 are susceptible to a reflected cross-site scripting flaw stemming from inadequate input validation within the host parameter. This vulnerability enables attackers to send specially crafted POST requests to the diag_ping.php endpoint, thereby injecting and executing arbitrary JavaScript in the browsers of unsuspecting users. Such an exploit utilizes the security lapse to manipulate user interactions and potentially steal sensitive information.

Affected Version(s)

OPNsense 19.1

References

https://www.exploit-db.com/exploits/46351
exploit
https://opnsense.org
product
https://forum.opnsense.org/index.php?topic=11469.0
patch

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Ozer Goker
.