This vulnerability, identified as CWE-79, exists in WooCommerce Multilingual & Multicurrency versions <= 5.5.6. It allows an attacker to perform cross-site scripting by injecting malicious input that is not properly neutralized during web page generation. The CVSS 3.1 base score is 7.1, reflecting network attack vector, low attack complexity, no privileges required, user interaction required, and impacts on confidentiality, integrity, and availability. The vulnerability is published and assigned CVE-2026-66711, but no official fix or patch has been disclosed yet.

Successful exploitation can lead to execution of arbitrary scripts in the context of the affected web application, potentially allowing attackers to steal user data, hijack user sessions, or perform actions on behalf of users. The vulnerability affects confidentiality, integrity, and availability of the application and its users. However, exploitation requires user interaction.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider limiting exposure by restricting user input or applying web application firewall (WAF) rules to detect and block XSS payloads targeting this plugin.