Ex-Googler here. Try reporting it through the security disclosure program: https://www.google.com/appserve/security-bugs/m2/new You can also assume that by virtue of you having posted this here and being on the frontpage, it's probably made it to the internal Google SRE IRC chat by now and someone is trying to find a contact. This almost always works :) Maybe edit your OP with a way to contact you , so that someone c…
But it's not even the first time this issue was posted here. I'm not sure that approach works with Google.