The Simple Flight Ticket Booking System 1.0 contains an SQL injection vulnerability in the POST parameter handler of the checkUser.php component. Specifically, the Username argument can be manipulated remotely to inject SQL commands due to insufficient input validation. This vulnerability is publicly known and assigned CVE-2026-11488 with a CVSS 4.0 base score of 6.9 (medium severity). No official fix or patch has been published by the vendor, and the system is not cloud-hosted, so remediation depends on the user or administrator.

Successful exploitation allows an unauthenticated remote attacker to perform SQL injection via the Username parameter, potentially leading to unauthorized access or modification of database information. The CVSS vector indicates limited impact on confidentiality, integrity, and availability, reflecting a medium severity risk. There are no known exploits 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 implementing input validation and parameterized queries as temporary mitigations to prevent SQL injection. Monitor for vendor updates regarding patches or official remediation.