The International Domain Name (IDN) support in Omniweb 5 allows remote attackers to spoof domain names using punycode encoded domain names that are decoded in URLs and SSL certificates in a way that uses homograph characters from other character sets, which facilitates phishing attacks.
https://exchange.xforce.ibmcloud.com/vulnerabilities/19236
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-0237
http://www.shmoo.com/idn/homograph.txt
http://www.securityfocus.com/bid/12461
http://marc.info/?l=bugtraq&m=110782704923280&w=2
http://lists.grok.org.uk/pipermail/full-disclosure/2005-February/031459.html