CVE-2019-25377

MEDIUM 5.4

OPNsense 19.1 Reflected XSS via system_advanced_sysctl.php

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

OPNsense 19.1 contains a reflected cross-site scripting vulnerability in the system_advanced_sysctl.php endpoint that allows attackers to inject malicious scripts via the value parameter. Attackers can craft POST requests with script payloads in the value parameter to execute JavaScript in the context of authenticated user sessions.

CWE	CWE-79
Vendor	opnsense
Product	opnsense
Published	Feb 15, 2026
Last Updated	Mar 5, 2026

Stay Ahead of the Next One

Get instant alerts for opnsense opnsense

Be the first to know when new medium vulnerabilities affecting opnsense opnsense are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

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-systemadvancedsysctlphp

Credits

Ozer Goker