CVE-2019-25375

MEDIUM 6.1

OPNsense 19.1 Reflected XSS via monit interface

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 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.

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-monit-interface

Credits

Ozer Goker