Do you remember that Ubuntu forum has been hacked in July this year? The admin(s) have said that they figured out the vulnerabilities and they have informed vBulletin.com about the finding. The vBulletin.com will fix the vulnerabilities. Do you remember?
However, admin(s) of Ubuntu forum are making a joke to us. Why?
The report at the INQUIRER :
The facebook of the Inj3ct0r Team :
I am doubt that the Ubuntu Forum is still safe even the SSO Login is implemented.