SQL injection vulnerabilities exist in the CheckDuplicateStudent.php page of OS4Ed openSIS 7.3. The ln parameter in the page CheckDuplicateStudent.php is vulnerable to SQL injection. An attacker can make an authenticated HTTP request to trigger this vulnerability.
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1072
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1072
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6121