CVE-2025-13347 is a SQL injection vulnerability identified in SourceCodester Train Station Ticketing System version 1.0. The vulnerability resides in the /ajax.php endpoint when the 'action' parameter is set to 'save_user'. Specifically, the 'Username' argument is not properly sanitized or validated, allowing an attacker to inject malicious SQL code. This flaw can be exploited remotely without requiring authentication or user interaction, making it accessible to a wide range of attackers. The vulnerability could allow attackers to manipulate backend database queries, potentially leading to unauthorized data access, modification, or deletion. The CVSS 4.0 vector indicates low complexity (AC:L), no privileges required (PR:L), no user interaction (UI:N), and partial impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). Although no known exploits are currently active in the wild, the publication of exploit code increases the risk of exploitation. The vulnerability affects only version 1.0 of the product, which is used for managing train station ticketing operations, a critical function in transportation infrastructure. The lack of available patches or vendor advisories necessitates immediate defensive measures by users of this software.

For European organizations, particularly those involved in public transportation and ticketing services, this vulnerability poses a significant risk. Exploitation could lead to unauthorized access to sensitive customer data, including personal information and ticketing details, potentially violating GDPR and other data protection regulations. Attackers could alter ticketing data, causing financial losses or service disruptions. The integrity of ticketing transactions could be compromised, leading to revenue loss and reputational damage. Availability of the ticketing system could also be affected if attackers execute destructive SQL commands or cause database corruption. Given the critical role of train station ticketing systems in European transport networks, successful exploitation could disrupt passenger services and erode public trust. Moreover, the remote and unauthenticated nature of the attack vector increases the likelihood of widespread exploitation if unmitigated.

Organizations should immediately audit and sanitize all inputs to the /ajax.php?action=save_user endpoint, implementing parameterized queries or prepared statements to prevent SQL injection. Deploying a Web Application Firewall (WAF) with rules targeting SQL injection patterns can provide an additional layer of defense. Monitoring logs for unusual database query patterns or repeated failed attempts to manipulate the 'Username' parameter is critical for early detection. If possible, restrict access to the vulnerable endpoint through network segmentation or IP whitelisting. Organizations should also engage with the vendor or community to obtain patches or updates and apply them promptly once available. Conducting regular security assessments and penetration testing on the ticketing system will help identify similar vulnerabilities. Finally, ensure that backups of the database are current and tested to enable recovery in case of data corruption or loss.