fixed some bug according to the reported security issues

git-svn-id: https://plugins.svn.wordpress.org/wp-classified/trunk@1030247 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixed some bug according to the reported security issues

git-svn-id: https://plugins.svn.wordpress.org/wp-classified/trunk@1030251 b8457f37-d9ea-0310-8a92-e5e31aec5664