This vulnerability (CVE-2026-66439) is classified as CWE-79, indicating improper neutralization of input during web page generation, leading to cross-site scripting (XSS). It affects BeRocket's Advanced AJAX Product Filters plugin for versions up to 3.2.0.3. The flaw allows unauthenticated attackers to inject malicious scripts, potentially impacting confidentiality, integrity, and availability. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, with low confidentiality and integrity impact and low availability impact. No vendor advisory or patch information is currently available.

Successful exploitation could allow an unauthenticated attacker to execute arbitrary scripts in the context of the affected web application, potentially leading to data disclosure, modification, or disruption of service. The CVSS score of 7.1 reflects a high severity with impacts on confidentiality, integrity, and availability. However, no known exploits are reported in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, consider applying web application firewall (WAF) rules to detect and block XSS attempts targeting this plugin. Monitor vendor channels for updates and apply patches promptly once available.