The Custom WooCommerce Checkout Fields Editor plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input during web page generation. Specifically, the save_wcfe_options function does not adequately sanitize or escape user input, allowing authenticated users with subscriber-level privileges or above to inject arbitrary JavaScript code. This code executes in the context of other users who access the injected pages, potentially leading to session hijacking or other client-side attacks. The vulnerability affects all versions up to and including 1.3.1. The CVSS 3.1 base score is 6.4 (medium severity), reflecting network attack vector, low attack complexity, required privileges, no user interaction, and partial impact on confidentiality and integrity.

An attacker with subscriber-level or higher access can inject persistent malicious scripts into pages generated by the plugin. These scripts execute in the browsers of users who view the infected pages, potentially exposing sensitive information or enabling further attacks such as session hijacking. The vulnerability does not impact availability. There are no known exploits in the wild currently.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict plugin usage to trusted users only and consider disabling or removing the plugin if possible. Monitor for updates from the vendor and apply patches promptly once available.