The YITH WooCommerce Wishlist plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) via the 'id' parameter in versions up to 4.5.0. Authenticated attackers with Contributor-level privileges or above can inject arbitrary web scripts due to improper input neutralization during web page generation. This vulnerability allows script execution in the context of users visiting the injected pages, potentially leading to session hijacking or other script-based attacks. The CVSS 3.1 base score is 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N), reflecting network attack vector, low attack complexity, required privileges, no user interaction, and partial impact on confidentiality and integrity without availability impact. No patch or vendor advisory is currently provided, and no known exploitation has been reported.

Successful exploitation allows authenticated users with Contributor-level access or higher to inject persistent malicious scripts that execute in the browsers of users visiting the affected pages. This can lead to partial confidentiality and integrity impacts, such as theft of user session data or manipulation of page content. There is no reported impact on system availability. The vulnerability affects all versions of the plugin up to 4.5.0.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict Contributor-level access to trusted users only and consider disabling or limiting the use of the affected plugin. Monitor official yithemes communications for updates regarding patches or mitigations.