UltraEmbed Advanced Iframe WordPress Plugin Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the UltraEmbed – Advanced Iframe Plugin for WordPress, specifically in versions through 1.0.3. This vulnerability arises from inadequate input sanitization and output escaping of user-supplied attributes in the plugin's 'iframe' shortcode. As a result, authenticated attackers with contributor-level access or higher can inject arbitrary web scripts into pages, which will execute when a user views 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.