Responsive Lightbox2 WordPress Plugin Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the Responsive Lightbox2 WordPress plugin, affecting versions prior to 1.0.4. The issue arises because the plugin fails to properly validate and escape certain shortcode attributes before rendering them on the page. This flaw enables users with a minimum role of contributor to execute stored cross-site scripting attacks.

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, a user with contributor privileges can insert a specific shortcode into a post or page. The shortcode should include a URL attribute with a JavaScript event, such as 'onmouseover', that triggers a JavaScript alert. Once the shortcode is saved and the post is viewed or previewed, the cross-site scripting payload will execute when the mouse hovers over the specified text.

Remediation

Users are advised to update the Responsive Lightbox2 WordPress plugin to version 1.0.4 or later.