CVE-2019-25369
Stored XSS in OPNsense sysctl Endpoint Enables Persistent Script Injection
Publication date: 2026-02-15
Last updated on: 2026-02-18
Assigner: VulnCheck
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
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 stored cross-site scripting (XSS) issue in OPNsense 19.1, specifically in the system_advanced_sysctl.php endpoint. It allows attackers to inject malicious scripts persistently via the tunable parameter. These scripts are stored on the server and executed in the context of authenticated user sessions when the affected page is viewed.
How can this vulnerability impact me? :
The impact of this vulnerability is that attackers can execute malicious scripts within authenticated user sessions. This can lead to unauthorized actions performed on behalf of the user, theft of sensitive information, session hijacking, or other malicious activities that compromise the security and integrity of the affected system.
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