Nexter Blocks WordPress Plugin Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the Nexter Blocks plugin for WordPress, affecting all versions through 4.5.4. The issue arises from inadequate input sanitization and output escaping on user-supplied attributes across multiple widgets. This vulnerability allows authenticated attackers with contributor-level access or higher 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 Blocks plugin to version 4.5.5 or later, where this vulnerability has been patched.