YouTube has fixed a flaw allowing hackers to bombard users with fake pop-up messages and redirect them to adult sites.
Hackers placed code in the comments section, under targeted videos, that would run when people watched the clip.
In some cases, a pop-up screen appeared reporting that the Canadian singer, Justin Bieber, had died in a car crash.
Google, which owns YouTube, said that it had fixed the problem "about two hours" after it was discovered.
"We took swift action to fix a cross-site scripting (XSS) vulnerability on youtube.com," a spokesperson said.
"Comments were temporarily hidden by default within an hour, and we released a complete fix for the issue in about two hours.
Cross-site scripting (XSS) vulnerabilities are relatively simple attacks that allow hackers to place code into web pages.
In the YouTube incident, hackers used JavaScript code and HTML, both commonly used on web pages.
Security experts said that although in most cases the code was relatively benign, it has been used for more malicious purposes.
"The thing with a cross-site scripting attack is that it will appear that it is a message being posted by that website, which gives it a certain legitimacy, Graham Cluley of security firm Sophos told BBC News.
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