The Radius Blocks plugin for WordPress contains a stored XSS vulnerability due to improper neutralization of input in the 'subHeadingTagName' parameter. This allows authenticated users with Contributor or higher privileges to inject arbitrary web scripts into pages. These scripts execute in the context of users who view the compromised pages, potentially leading to session hijacking or other script-based attacks. The vulnerability affects all versions up to and including 2.2.1. No known exploits are reported in the wild, and no patch or official fix has been documented yet.

An attacker with Contributor-level or higher access can exploit this vulnerability to inject persistent malicious scripts into pages generated by the plugin. This can lead to unauthorized actions performed in the context of other users viewing the injected content, such as theft of session tokens or defacement. The impact is limited by the requirement for authenticated access with at least Contributor privileges. There is no indication of impact on availability or system integrity beyond the XSS scope.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, limit Contributor-level access to trusted users only. Consider disabling or removing the Radius Blocks plugin if possible to prevent exploitation. Monitor official vendor channels for updates or patches addressing this vulnerability.