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A user registered on my site a few weeks ago. Today I looked at my posts, and the author for most of my posts have been changed to that user.
I checked the revision history, and the posts have not been changed at all. But somehow that user was listed as the author.
I deleted the user account and attributed all the posts back to myself.
Any idea what happened? I scanned the site with Sucuri SiteCheck and it didn’t encounter any malware.