Judging from the severity of the errors, and, the length of time it's taking them to correct (almost a week, now) -- I'd say the site got hacked and the perpetrator injected some malicious code. Same thing happened to us on our corporate blog site 4 to 5 years ago. Took our 3rd party web guys 2-weeks and cost us about $2,500 for them to go through every line of code on our blog site to isolate and remove the malicious code. Our blog site is Word-Press based, which is totally ok, AS LONG AS you keep it updated with the latest word press security releases (which, we didn't): Lesson-Learned: Check the blog site every day and make sure you are on the latest update release.
Best
-MailGuru