CVE-2025-11358 identifies a SQL injection vulnerability in the Simple Banking System 1.0 developed by code-projects, specifically in the /removeuser.php script. The vulnerability stems from insufficient input validation or sanitization of the 'ID' parameter, which is used in SQL queries to remove users. An attacker can remotely manipulate this parameter to inject arbitrary SQL commands, potentially bypassing authentication or authorization controls, and executing unauthorized database operations. The vulnerability does not require user interaction or elevated privileges, increasing its risk profile. The CVSS 4.0 base score is 5.3 (medium), reflecting network attack vector, low complexity, no privileges required, and no user interaction. The impact on confidentiality, integrity, and availability is limited but present, as attackers can potentially access or modify user data or disrupt user removal functionality. Although no active exploitation has been reported, the public availability of exploit code increases the likelihood of attacks. The lack of official patches or mitigations from the vendor necessitates immediate defensive measures by users of this software. This vulnerability is critical for banking systems where data integrity and confidentiality are paramount, and unauthorized user removal or data manipulation could have severe consequences.

For European organizations, especially those in the financial sector using the Simple Banking System 1.0, this vulnerability poses a risk of unauthorized access to sensitive customer data and potential manipulation or deletion of user records. Such breaches could lead to financial fraud, regulatory non-compliance (e.g., GDPR violations), reputational damage, and operational disruptions. The ability to remotely exploit the vulnerability without authentication increases the attack surface, potentially allowing attackers to compromise multiple systems if the software is widely deployed. Even though the CVSS score is medium, the critical nature of banking data elevates the practical impact. Organizations may face legal and financial penalties if customer data confidentiality or integrity is compromised. Additionally, attackers could leverage this vulnerability as a foothold for further network penetration or lateral movement within an organization's infrastructure.

1. Immediately implement input validation and sanitization on the 'ID' parameter in /removeuser.php to prevent SQL injection. 2. Refactor the code to use parameterized queries or prepared statements instead of dynamic SQL concatenation. 3. Restrict access to the /removeuser.php endpoint using network segmentation, firewalls, or application-level access controls to limit exposure. 4. Monitor logs for unusual or suspicious requests targeting the 'ID' parameter or the /removeuser.php script. 5. If possible, upgrade to a patched version of the software once available or apply vendor-provided patches. 6. Conduct a thorough security audit of the entire application to identify and remediate other potential injection points. 7. Educate developers on secure coding practices to prevent similar vulnerabilities in future releases. 8. Employ Web Application Firewalls (WAFs) with SQL injection detection rules as an interim protective measure. 9. Regularly back up databases and ensure recovery procedures are tested to mitigate data loss in case of exploitation.