"The vulnerability that I want to share first, Is a critical vulnerability in Blogger (Google Service),
That vulnerability could be used by an attacker to get administrator privilege over any blogger account (Permission Issue),Yes I know it sound kind of crazy but it's true :),
Here are the details regarding the issue in Blogger service,
I found a HTTP Parameter Pollution vulnerability in Blogger that allow an attacker to add himself as an administrator on the victim's blogger account,"