Directory traversal vulnerability in wp-db-backup.php in Skippy WP-DB-Backup plugin for WordPress 1.7 and earlier allows remote authenticated users with administrative privileges to read arbitrary files via a .. (dot dot) in the backup parameter to edit.php.
https://exchange.xforce.ibmcloud.com/vulnerabilities/28375
http://www.vupen.com/english/advisories/2006/3280
http://www.skippy.net/blog/category/wordpress/plugins/wp-db-backup/
http://www.securityfocus.com/archive/1/443181/100/0/threaded
http://trac.wordpress.org/changeset/4095