SQL injection vulnerability in PHPGurukul Student Record System 4.0 allows remote attackers to execute arbitrary SQL statements, via the sid parameter to edit-sub.php.
https://phpgurukul.com/wp-content/uploads/2019/05/schoolmanagement.zip
https://packetstormsecurity.com/files/161237/Student-Record-System-4.0-SQL-Injection.html
https://github.com/BigTiger2020/Student-Record-System-/blob/main/README.md