YouTube Playlists with Schema Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the YouTube Playlists with Schema plugin for WordPress, affecting all versions through 2.6.1. The vulnerability arises from inadequate input sanitization and output escaping of user-supplied attributes in the 'yt_grid' shortcode. This flaw allows authenticated attackers with contributor-level access or higher to inject arbitrary 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.

Reproduction

To reproduce this vulnerability, an authenticated user with contributor-level access or higher can use the 'yt_grid' shortcode. The absence of proper input sanitization and output escaping on the attributes provided to this shortcode enables the injection of malicious scripts. Once injected, these scripts will execute whenever the page is accessed by a user.