A hacker using the handle Sejeal has posted a pastebin post with a short message. In the message they claim they have hacked a data center and as a result over 20,000 websites have been breached and now left defaced with the above image. The attack has been done for Christmas which goes to show that not even hackers will stop to take time off for the holiday seasons.
In The Named Of God Hi,Here is Sejeal To Memorial Of Gaza Martyrs In Christmas Day We Got Hacked A Datacenter Located In America. And In a Day We Defaced Around 20000 Ips And We Just Submit 4 000 Of Them In Zone-h,Look This >> https://www.zone-h.org/archive/notifier=Sejeal Project Will Be Continued…
From a quick check of a few of the sites domain details it does appear that these are all hosted on either vps or dedicated hosting with a few on shared. As for confirmation that 20,000 have been breached its impossible to clarify this at time of publishing how ever as stated by Sejeal, around 4,000 of them can be seen on Zone-H Source: pastebin