Just found this on Secunia's site.
Secunia Advisory: SA12028
Release Date: 2004-07-08
Where: From remote
Software: Opera 5.x
bitlance winter has discovered a vulnerability in the Opera browser, which potentially can be exploited by malicious people to conduct phishing attacks against a user.
Input the URL to trusted sites directly in the address bar and don't follow links from untrusted sources.
Read Security Bulletin