Shortly after the incident Google explained the situation in the folowing statement:
“We took swift action to fix a cross-site scripting (XSS) vulnerability on youtube.com that was discovered several hours ago. Comments were temporarily hidden by default within an hour, and we released a complete fix for the issue in about two hours. We’re continuing to study the vulnerability to help prevent similar issues in the future.”
A Google representative said the hackers couldn't have the access to Google accounts of YouTube visitors who encountered a hacked page. But it would be better for them to log out of their Google accounts and then log back in.
Google disabled comments within an hour of the start of the attack, then corrected the exploited bug within two hours, according to a statement sent to The Next Web.
The hackers are members of the Internet community 4chan, which has been waging a small cultural war against Justin Bieber.
Source:
http://it.moldova.org/news/youtube-hacked-because-of-justin-bieber-its-your-fault-210645-eng.html
