Wordfence report says I have hundreds of unknown files in WP core.

You are not alone. I have two completely unrelated sites doing this after the update. Are you by any chance a Bluehost customer?

@danielsteel Do not fret. Have you read this post? https://www.ads-software.com/support/topic/ouch-unknown-file-in-wordpress-core-wp-v6-7/#post-18133181

Hi @danielsteel,

The issue was due to the process that mirrors new core releases not completing normally and stopping halfway. The issue is now fully resolved, we have additional alerting in place in case it occurs again and we’re refactoring the code that runs this process to make it far more robust.

Subsequent automatic or manual scans should no longer show the files as unknown. We have some documentation on these scan results here in general for reference, and restoring deleted or repaired files from a backup if the site has issues is the best option:?https://www.wordfence.com/help/scan/scan-results/#unknown-file-in-wordpress-core

Please also check the following topic: Check or Subscribe to the Wordfence status updates

Many thanks,
Peter.

Thanks @wfpeter!

For the record, I had the same experience. Two completely unrelated, very low traffic sites (one obsolete dev site and one legacy client site) showing 1508 and 1319 respectively.