SQL Injection in SourceCodester Class and Exam Timetabling System 1.0 /preview.php

Successful exploitation can allow an attacker to manipulate backend database queries. Depending on the application's database permissions and query context, this may result in unauthorized disclosure of database contents, modification or deletion of records, authentication bypass in some scenarios, and broader compromise of application data integrity and confidentiality.

If an immediate patch is not available, restrict access to the affected application and especially the vulnerable endpoint where possible, including network-layer allowlisting or authentication gating. Deploy or tune a WAF to detect and block SQL injection payloads targeting the course_year_section parameter. Reduce database account privileges used by the application to the minimum necessary, and increase logging and monitoring for anomalous requests to /preview.php and suspicious database errors or query patterns.

Upgrade to a vendor-fixed release if one is available. In the vulnerable /preview.php code path, remediate the issue by replacing unsafe dynamic SQL construction involving course_year_section with parameterized queries or prepared statements. Apply strict server-side input validation and type/format enforcement for the parameter, and review similar code paths for the same flaw pattern.