Nexter Extension Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the Nexter Extension - Site Enhancements Toolkit plugin for WordPress, affecting all versions through 4.4.1. The issue arises from inadequate input sanitization and output escaping in the plugin's 'nxt-year' shortcode. This vulnerability allows authenticated attackers with Contributor-level access and above to inject arbitrary web scripts into pages, which are executed when users access the affected pages.

Impact

Exploitation of this vulnerability allows for stored cross-site scripting, where injected scripts are executed in the context of the user viewing the page.

Remediation

Users are advised to update the Nexter Extension - Site Enhancements Toolkit plugin to version 4.4.2 or a newer patched version.