CVE-2004-2226 - Unprofaned Clap
Description
Mozilla Mail 1.7.1 and 1.7.3 and Thunderbird before 0.9 when HTML-Mails is enabled allows remote attackers to determine valid e-mail addresses via an HTML e-mail that references a Cascading Style Sheets (CSS) document on the attacker’s server.
Reference
http://archives.neohapsis.com/archives/fulldisclosure/2004-11/0070.html http://www.osvdb.org/11394 http://secunia.com/advisories/13086 https://exchange.xforce.ibmcloud.com/vulnerabilities/17949