Microsoft Internet Explorer 5.01, 5.5, and 6, when using an HTTPS proxy server that requires Basic Authentication, sends URLs in cleartext, which allows remote attackers to obtain sensitive information, aka "HTTPS Proxy Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1521
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1435
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1317
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1143
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1101
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1097
https://exchange.xforce.ibmcloud.com/vulnerabilities/23451
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2005/ms05-054
http://www130.nortelnetworks.com/cgi-bin/eserv/cs/main.jsp?cscat=BLTNDETAIL&DocumentOID=375420
http://www.vupen.com/english/advisories/2005/2909
http://www.vupen.com/english/advisories/2005/2867
http://www.securityfocus.com/bid/15825
http://support.avaya.com/elmodocs2/security/ASA-2005-234.pdf
http://securitytracker.com/id?1015350
http://secunia.com/advisories/18311