SQL Injection vulnerability exists in Sourcecodester. Simple Subscription Website 1.0. via the login.
https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-43140
https://github.com/Dir0x/CVE-2021-43140
http://packetstormsecurity.com/files/164968/Simple-Subscription-Website-1.0-SQL-Injection.html