Missing Authorization vulnerability in RumbleTalk Ltd RumbleTalk Live Group Chat allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects RumbleTalk Live Group Chat: from n/a through 6.2.5.

The RumbleTalk Live Group Chat – HTML5 plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'rumbletalk-admin-button' shortcode in all versions up to, and including, 6.3.0 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.