SeatReg WordPress Plugin Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the SeatReg plugin for WordPress, affecting all versions through 1.56.0. The issue arises from inadequate input sanitization and output escaping of user-supplied attributes in the 'seatreg' shortcode. This vulnerability allows authenticated attackers with contributor-level access or higher to inject arbitrary scripts into pages, which are executed when users access the affected page.

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 'seatreg' shortcode without proper sanitization. This can be done by injecting a script into a user-supplied attribute, which will be executed when the page is viewed.

Remediation

Users are advised to update the SeatReg WordPress plugin to version 1.56.1 or later.