Image Over Image For WPBakery Page Builder WordPress Plugin Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the Image Over Image For WPBakery Page Builder WordPress plugin, affecting versions prior to 3.0. The issue arises because the plugin fails to properly validate and escape certain shortcode attributes before rendering them on a page or post. This flaw enables users with contributor roles and above to inject malicious scripts that are executed when the content is viewed.

Impact

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

Reproduction

To reproduce this vulnerability, use a WordPress site with the affected plugin version installed. Embed the 'image_over_image_vc' shortcode in a post or page, including unescaped JavaScript in the 'ioi_caption_url' attribute and a script in the 'ioi_image_effect' attribute. Other affected attributes include 'ioi_url_target'. Once the post is published, the injected script will execute when the page is viewed.

Remediation

Users are advised to update the Image Over Image For WPBakery Page Builder WordPress plugin to version 3.0 or later.