It is not that I actually got a reference, but I sent an email to all my customers regarding the zero day exploit from Microsoft:

https://www.bleepingcomputer.com/news/microsoft/windows-mshtml-zero-day-defenses-bypassed-as-new-info-emerges/

I told them all to be aware and gave them handy advice without much text.

One of them, let's call him Mr. R. responded immediately, obviously in German so I will translate it:

Hamza helped me actually since he pointed to this vulnerability