I was about to say that someone was testing to see whether you had a security breach available for a known exploit - that’s what I would have expected (and would have locked down tight before anyone could visit).
If it’s from your own website, that doesn’t mean that there was not a hacker testing your website so, please, investigate further!
I’ve already battened down the hatches, but I think I’ll have a word with the wordfence people - see if I should expect this kind of query. It’s just that I have been using wordfence for some months now, and I’ve never seen it before.