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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction Active

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0001.

Exploitation poc

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Opnsense Subscribe
Opnsense Subscribe

Configuration 1 [-]

cpe:2.3:a:opnsense:opnsense:19.1:*:*:*:*:*:*:*

No data.

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Vendors Products
Opnsense Subscribe
Opnsense Subscribe
Advisories

No advisories yet.

Fixes

Solution

OPNsense 19.1.1 released

Workaround

No workaround given by the vendor.

References
Link Providers
https://forum.opnsense.org/index.php?topic=11469.0 cve-icon cve-icon
https://opnsense.org cve-icon cve-icon
https://www.exploit-db.com/exploits/46351 cve-icon cve-icon
https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-systemadvancedsysctlphp cve-icon cve-icon
History

Wed, 18 Feb 2026 19:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:opnsense:opnsense:19.1:*:*:*:*:*:*:*

Tue, 17 Feb 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

 ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 17 Feb 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Sun, 15 Feb 2026 14:15:00 +0000

Type Values Removed Values Added
Description 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.
Title OPNsense 19.1 Reflected XSS via system_advanced_sysctl.php
First Time appeared Opnsense
Opnsense opnsense
Weaknesses CWE-79
CPEs cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:*
Vendors & Products Opnsense
Opnsense opnsense
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 4.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-02-17T16:51:41.154Z

Reserved: 2026-02-15T13:24:15.625Z

Link: CVE-2019-25377

cve-icon Vulnrichment

Updated: 2026-02-17T14:42:15.308Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-15T14:16:07.763

Modified: 2026-02-18T19:08:16.513

Link: CVE-2019-25377

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-16T09:42:50Z

Weaknesses