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5.1
OPNsense 19.1 allows attackers to inject malicious scripts in users' browsers
CVE-2019-25371
Summary
OPNsense 19.1 has a security flaw that lets hackers inject malicious code into users' browsers through the diag_ping.php page. This could allow them to steal sensitive information or take control of users' devices. Update to a patched version to fix this issue.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| opnsense | opnsense | 19.1 | – |
Original title
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host param...
Original description
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host parameter. Attackers can submit crafted POST requests to the diag_ping.php endpoint with script payloads in the host parameter to execute arbitrary JavaScript in users' browsers.
nvd CVSS3.1
6.1
nvd CVSS4.0
5.1
Vulnerability type
CWE-79
Cross-site Scripting (XSS)
- https://forum.opnsense.org/index.php?topic=11469.0 Release Notes
- https://opnsense.org Product
- https://www.exploit-db.com/exploits/46351 Exploit Third Party Advisory VDB Entry
- https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-diagpingphp Broken Link
Published: 15 Feb 2026 · Updated: 10 Mar 2026 · First seen: 6 Mar 2026