Provide references for CVE-2021-3239.
Where can I find more information about CVE-2021-3239?
References are available at: https://github.com/TCSWT/E-Learning-System/blob/main/README.md, https://www.exploit-db.com/exploits/49434, https://www.sourcecodester.com/php/12808/e-learning-system-using-phpmysqli.html, https://packetstormsecurity.com/files/160966/E-Learning-System-1.0-SQL-Injection-Shell-Upload.html, https://github.com/nu11secur1ty/CVE-nu11secur1ty/tree/main/vendors/janobe/CVE-nu11-101821.