The newspaper reported on Tuesday, that hackers had leaked onto the internet, the user names and passwords of around 80,000 accounts at bloggtoppen.se, including several politicians and journalists. The site was immediately shutdown.
The sites affected range from emusic.se to genealogi.se.
" I cannot remember an attack this big in recent years," Joakim von Braun, Swedish National Radio's security expert told SVT.
Aftonbladet's research suggests that the conservative Moderate Party is the worst affected of the political parties.