xipblog module v2.0.1 and before for PrestaShop allows unauthenticated remote attackers to inject arbitrary JavaScript via the name and content parameters in ajax.php. The input is stored in the database without HTML sanitization and rendered in Smarty templates without output escaping, resulting in Stored Cross-Site Scripting (XSS). When an administrator reviews comments in the back office, the payload executes with admin-level session context, leading to full store compromise.