Microsoft Office Excel 2007 Gold and SP1 does not properly delete the PWD (password) string from connections.xml when a .xlsx file is configured not to save the remote data session password, which allows local users to obtain sensitive information and obtain access to a remote data source, aka the "Excel Credential Caching Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5951
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2008/ms08-043
http://www.vupen.com/english/advisories/2008/2347
http://www.us-cert.gov/cas/techalerts/TA08-225A.html
http://www.securitytracker.com/id?1020669
http://www.securityfocus.com/bid/30641