Someone, somewhere, has stolen your cookies. Don't worry, it's probably not the Russians. It's probably just your neighbor's kid who's been sneaking into your browser.
Learn more about Cookie TheftYour browser's cookies are so delicious that hackers are now using them for their own nefarious purposes. Don't worry, it's not like you'll ever notice.
Read about Session HijackingSomeone, somewhere, has injected malicious JavaScript into your browser. But don't worry, it's probably just a joke. Or is it?
Learn more about Cross-Site Scripting