The vulnerability CVE-2026-13488 affects SourceCodester Class and Exam Timetabling System 1.0 in the /preview7.php file. It allows an attacker to perform SQL injection by manipulating the course_year_section argument. This can be exploited remotely without authentication, potentially leading to unauthorized database queries or data exposure. The CVSS 4.0 vector indicates network attack vector, low complexity, no privileges or user interaction required, with low to limited impact on confidentiality, integrity, and availability. No official fix or patch has been identified in the vendor advisory or other sources.

Successful exploitation of this SQL injection vulnerability could allow an attacker to execute arbitrary SQL commands on the backend database. This may lead to unauthorized data access, modification, or deletion depending on the database permissions. The impact is rated medium due to limited confidentiality, integrity, and availability impacts as per the CVSS vector. There are no confirmed reports of exploitation in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider applying input validation and parameterized queries on the course_year_section parameter to mitigate SQL injection risks. Monitoring for unusual database activity may also help detect exploitation attempts.