CSS and JavaScript Toolbox Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the CSS & JavaScript Toolbox plugin for WordPress, affecting all versions through 12.0.5. The issue arises from inadequate input sanitization and output escaping, allowing authenticated attackers with administrator-level permissions to inject arbitrary scripts. These scripts are executed when users access the affected pages. This vulnerability is present in multi-site installations where unfiltered_html has been disabled.

Impact

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

Reproduction

To reproduce this vulnerability, an authenticated user with administrator-level permissions can inject scripts through the admin settings of the CSS & JavaScript Toolbox plugin. The injected scripts will be executed when the corresponding page is accessed.

Remediation

Users are advised to update the CSS & JavaScript Toolbox plugin to version 12.0.6 or later.