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400 000 websites on the internet can be easily hacked, using a simple vulnerability in the subdomain system. Malefactors can use information from subdomains to get sensitive data about your business, clients or even hack the main website. Competitors can use it to get information about competitor’s technologies, projects under development, strong and weak sides. The article will be useful for cybersecurity specialists, CISO, company owners, system administrators, and bug hunters. A subdomain is an appendix to your main website domain, like subdomain.example.com.