Exploit detected!

An exploit has been detected by Avast! 5.0.462. It is bieng occassionally detected during the last 15 days, mostly when I visit the Avira Support Forum as you ca see from the attached picture below. What is happening and is my computer at risk?

Please, NEVER post twice the same. Just double the help effort.
Follow http://forum.avast.com/index.php?topic=58256.0;topicseen