Threats affecting pkg:npm/suneditor

SunEditor is a lightweight and powerful WYSIWYG editor in vanilla JavaScript with no dependencies. Prior to 2.47.11, the sanitizer in src/lib/core.js does not consistently reject namespaced or custom HTML elements, allowing event-handler attributes to remain on crafted elements. When an application renders attacker-controlled editor content and a user interacts with the element, the retained handler can execute script in the application's browser origin, enabling stored cross-site scripting, data exposure, or unauthorized browser-context actions. This issue is fixed in version 2.47.11.

A DOM-based Cross-Site Scripting (XSS) vulnerability exists in the SunEditor Embed plugin versions 3.0.0 up to but not including 3.1.4. The vulnerability arises when an attacker includes an external script element after an iframe embed, bypassing the plugin's sanitization and causing the script to execute in the context of the editor page. This can lead to arbitrary JavaScript execution when malicious content is stored or reflected without additional backend sanitization.