CVE-2025-13276 identifies a SQL Injection vulnerability in the g33kyrash Online-Banking-System, specifically within the /index.php file where the Username parameter is improperly sanitized. This allows remote attackers to inject arbitrary SQL commands without authentication or user interaction, exploiting the system over the network. The vulnerability affects versions up to the commit 12dbfa690e5af649fb72d2e5d3674e88d6743455, but due to the product's rolling release model, exact versioning is unclear, complicating patch identification. The CVSS 4.0 score of 6.9 reflects a medium severity, considering the attack vector is network-based with low complexity and no privileges or user interaction required, but with limited scope and impact on confidentiality, integrity, and availability. The exploit is publicly available, increasing the risk of exploitation, although no active exploitation has been reported yet. The vulnerability could allow attackers to extract sensitive banking data, modify or delete records, or disrupt service availability, posing significant risks to financial institutions. The lack of official patches or updates at the time of publication necessitates immediate mitigation efforts by organizations using this system.

For European organizations, particularly banks and financial institutions using the g33kyrash Online-Banking-System, this vulnerability could lead to unauthorized disclosure of sensitive customer data, financial fraud, and disruption of online banking services. The compromise of banking data could result in regulatory penalties under GDPR due to data breaches, loss of customer trust, and financial losses. The ability to remotely exploit the vulnerability without authentication increases the attack surface, making it easier for cybercriminals to target multiple institutions. Additionally, the public availability of exploits raises the likelihood of opportunistic attacks. The rolling release nature of the software complicates patch management, potentially delaying remediation and increasing exposure time. European financial sectors are heavily regulated and targeted by threat actors, so this vulnerability represents a significant risk to operational continuity and data security.

Organizations should immediately implement strict input validation and sanitization on the Username parameter to prevent SQL injection. Employ parameterized queries or prepared statements in the database access code to eliminate direct injection risks. Conduct thorough code reviews focusing on input handling in /index.php and related modules. Deploy web application firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting the Username parameter. Monitor logs for unusual database queries or failed login attempts indicative of exploitation attempts. Engage with the vendor or development team to obtain patches or updates addressing this vulnerability, and apply them promptly once available. Consider isolating or restricting access to the affected system components until remediation is complete. Educate security teams on this specific threat to enhance detection and response capabilities. Finally, perform penetration testing and vulnerability scanning regularly to identify and remediate similar injection flaws proactively.