The Download Validation in LaunchServices for Apple Mac OS X 10.4.7 can identify certain HTML as "safe", which could allow attackers to execute Javascript code in local context when the "Open 'safe' files after downloading" option is enabled in Safari.
http://lists.apple.com/archives/security-announce/2006//Aug/msg00000.html
http://secunia.com/advisories/21253
https://exchange.xforce.ibmcloud.com/vulnerabilities/28146