Reflected Cross-Site Scripting Vulnerability in OPNsense by Deciso
CVE-2019-25375

5.1MEDIUM

Key Information:

Vendor

Opnsense

Status
Opnsense
Vendor
CVE Published:
15 February 2026

Badges

👾 Exploit Exists

What is CVE-2019-25375?

OPNsense 19.1 is susceptible to a reflected cross-site scripting vulnerability that can be exploited by unauthorized users. This security flaw enables attackers to inject harmful JavaScript payloads into the mailserver parameter and submit them through POST requests to the monit interface. Upon doing so, the malicious scripts can execute in the browsers of users who access the impacted service, thereby potentially allowing attackers to manipulate user sessions or steal sensitive data.

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
.