Fix reflected XSS security vulnerabilities and contact form display bug. #52
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While researching security vulnerabilities also discovered a bug where the contact form for a listing doesn't display if wp_listings_default_form exists but is null.
Reflective XSS is in a post request, still an issue but low impact. Fixed with wp built in esc_html().
References:
http://php-grinder.com/project/view/31097
http://phpsecurity.readthedocs.org/en/latest/Cross-Site-Scripting-(XSS).html