The Optimole WordPress plugin before 4.2.13 does not escape unrecognized attributes of its video-player block before rendering them onto the block's wrapper element, allowing users with the Author r…

Summary

The Optimole WordPress plugin before 4.2.13 does not escape unrecognized attributes of its video-player block before rendering them onto the block's wrapper element, allowing users with the Author role and above to store an event-handler attribute that executes scripts in the browser of any user, such as an administrator, who views the post.