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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: ImpressCMS v1.4.4 - Unrestricted File Upload
# Date: 7/4/2022
# Exploit Author: Ünsal Furkan Harani (Zemarkhos)
# Vendor Homepage: https://www.impresscms.org/
# Software Link: https://github.com/ImpressCMS/impresscms
# Version: v1.4.4

# Description:
Between lines 152 and 162, we see the function "extensionsToBeSanitized".Since the blacklist method is weak, it is familiar that the file can be uploaded in the extensions mentioned below.

.php2, .php6, .php7, .phps, .pht, .pgif, .shtml, .htaccess, .phar, .inc

Impresscms/core/File/MediaUploader.php Between lines 152 and 162:
private $extensionsToBeSanitized = array('php','phtml','phtm','php3','php4','cgi','pl','asp','php5');