Multiple SQL Injection vulnerabilities exist in AbhishekMali21 GYM-MANAGEMENT-SYSTEM 1.0 via the 'name' parameter in (1) member_search.php, (2) trainer_search.php, and (3) gym_search.php, and via the 'id' parameter in (4) payment_search.php. An unauthenticated remote attacker can exploit these issues to inject malicious SQL commands, leading to unauthorized data extraction, authentication bypass, or modification of database contents.