How to fix CVE-2019-25369?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Is PHP affected by CVE-2019-25369?

Organizations using OPNsense 19.1 should be aware of moderate risk from CVE-2019-25369, a cross-site scripting vulnerability rated CVSS 6.4. Attackers could inject scripts to steal sessions or perform actions as authenticated users. Proof-of-concept code is publicly available.

CVE-2019-25369

MEDIUM

2026-02-15 [email protected]

6.4

CVSS 3.1

CVSS Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 18, 2026 - 19:15 vuln.today

Public exploit code

CVE Published

Feb 15, 2026 - 14:16 nvd

MEDIUM 6.4

Description

OPNsense 19.1 contains a stored cross-site scripting vulnerability in the system_advanced_sysctl.php endpoint that allows attackers to inject persistent malicious scripts via the tunable parameter. Attackers can submit POST requests with script payloads that are stored and executed in the context of authenticated user sessions when the page is viewed.

Analysis

Technical Context

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects the system_advanced_sysctl.php component of Opnsense. OPNsense 19.1 contains a stored cross-site scripting vulnerability in the system_advanced_sysctl.php endpoint that allows attackers to inject persistent malicious scripts via the tunable parameter. Attackers can submit POST requests with script payloads that are stored and executed in the context of authenticated user sessions when the page is viewed.

Affected Products

Vendor: Opnsense. Product: Opnsense. Versions: up to 19.1. Component: system_advanced_sysctl.php.

Remediation

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.0

CVSS: +32

POC: +20

CVE-2019-25369 vulnerability details – vuln.today

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CVE-2019-25369

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CVE-2019-25369

CVSS Vector

Lifecycle Timeline

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Description

Analysis

Technical Context

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External POC / Exploit Code