Content Egg < 11.9.0 - Contributor+ Stored XSS via Import Queue

Description

The plugin does not verify that a user running its bulk content-import feature is authorized for the import preset they select, and switches to the preset author's identity before creating the resulting post, allowing users with contributor-level access and above to store arbitrary web scripts unfiltered under a privileged user's account, executing in the context of anyone who later views that content.