PHP Gift Registry 1.5.5 - SQL Injection

# Exploit Title: PHP Gift Registry 1.5.5 SQL Injection
# Date: 02/22/12
# Author: G13
# Software Link: https://sourceforge.net/projects/phpgiftreg/
# Version: 1.5.5
# Category: webapps (php)
#

##### Vulnerability #####

The userid parameter in the users.php file is vulnerable to SQL 
Injection.

A user must be signed in to exploit this.

##### Exploit #####

http://localhost/phpgiftreg/users.php?action=edit&userid=[SQLi]