CVE-2019-25377
Reflected XSS in OPNsense system_advanced_sysctl.php Endpoint
Publication date: 2026-02-15
Last updated on: 2026-02-18
Assigner: VulnCheck
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| opnsense | opnsense | 19.1 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a reflected cross-site scripting (XSS) issue found in OPNsense 19.1, specifically in the system_advanced_sysctl.php endpoint.
Attackers can exploit this by sending specially crafted POST requests containing malicious script code in the 'value' parameter.
When an authenticated user interacts with this endpoint, the injected script executes in their browser context, potentially compromising their session.
How can this vulnerability impact me? :
This vulnerability can allow attackers to execute arbitrary JavaScript code within the context of authenticated user sessions.
Such execution can lead to theft of sensitive information, session hijacking, or performing unauthorized actions on behalf of the user.
Because the attack requires an authenticated user and user interaction, the risk is moderate but still significant.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know