CVE-2019-25375CWE-79

OPNsense 19.1 Reflected XSS via monit interface

Medium · published February 15, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
34.8
In the wild
Unconfirmed
What it is

OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by submitting crafted input to the mailserver parameter. Attackers can send POST requests to the monit interface with JavaScript payloads in the mailserver parameter to execute arbitrary code in users' browsers.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
EPSS
0.00416 · 34.8th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-02-15T13:58Z
EPSS history
Timeline
  • 15 FEB 13:58Z
    OPNsense 19.1 Reflected XSS via monit interface
    cvelistv5