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5.1
OPNsense 19.1 Allows Attackers to Inject Malicious Scripts in Users' Browsers
CVE-2019-25376
Summary
A security issue in OPNsense 19.1 allows hackers to inject malicious code into users' browsers without needing a password. This can happen when a user visits a website that sends a special request to the OPNsense proxy server. To fix this, update to a patched version of OPNsense or apply the available patch.
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 submitting crafted payloads through the ignoreLogACL param...
Original description
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by submitting crafted payloads through the ignoreLogACL parameter. Attackers can send POST requests to the proxy endpoint with JavaScript code in the ignoreLogACL parameter to execute arbitrary scripts 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
- https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-proxy-endpoint Third Party Advisory
Published: 15 Feb 2026 · Updated: 11 Mar 2026 · First seen: 6 Mar 2026