Opera Users Exposed to BlackHole through Browser Homepage

Earlier today [Wed, Nov 14], the Bitdefender automated scan systems alerted us to the fact that a malicious obfuscated script loaded by hxxp://portal.opera.com address redirects users towards a malicious page hosting the notorious BlackHole exploit. Apparently, the script has been loaded through third-party advertisement, a practice commonly known as malvertising.

http://www.hotforsecurity.com/blog/opera-users-exposed-to-blackhole-through-browser-homepage-4431.html