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Medium · 6.1 CVE-2019-25376 EUVD-2019-19418GHSA-2444-5vx9-4q2f

OPNsense 19.1 Reflected XSS via proxy endpoint

Published Feb 15, 2026 · Updated May 24, 2026 · Assigned by VulnCheck

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.

Affected products

VendorProductAffectedFixed
Opnsense OPNsense 19.1 —

References