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Using unsuspecting WordPress sites as amplification vectors, a hacker takes down a popular Web site for hours.
The site has since recovered after being hit yesterday by the Citadel Trojan, a form of malware that hunts for IDs and passwords.
Go Daddy is investigating how 450 Web sites it hosts were compromised. Visitors who'd arrived at the sites from search engines were being redirected to a site with malware on it.
Yahoo is the latest online service to confirm the disclosure of passwords belonging to throngs of its users. Here's what we know -- and, more important, what you need to do to protect yourself.