Wordfence sent an alert about a changed core file, but only to the client's old e-mail address.
- WebCrew's own core-file check finds the same changed file and tells you, not the client.
- You compare the file against the release, replace it, and rotate the administrator passwords.
- The entry point was a plugin two versions behind; that update now waits in your queue on every site.
Two checks agree, and the message reaches the right person first.