How I hacked 40 Websites in 7 minutes
medium.comtl;dr horrible php apps with zero security can be pwned with decades old vulnerabilities. <looks right> <looks left> uh huh. About as impressive as popping calc on an unattended computer at bestbuy. If you want to learn web security, check out: pentesterlab.com
Almost accurate tl;dr, it was a mix of perl and php. I've already done most free material from pentesterlab.com May I further suggest: hackthebox.eu and https://lab.pentestit.ru/