CVE-2025-57423 is a SQL injection vulnerability identified in the /articles endpoint of the MyClub 0.5 application. This vulnerability arises due to insufficient input sanitization on multiple query parameters, specifically Content, GroupName, PersonName, lastUpdate, pool, and title. An unauthenticated remote attacker can exploit this flaw by crafting a specially designed GET request that injects arbitrary SQL commands into the backend database query. This injection can lead to unauthorized disclosure of sensitive information stored in the database or manipulation of the database contents, such as modifying, deleting, or inserting data. The vulnerability affects MyClub 0.5, but no specific affected versions or patches have been provided, indicating that the vulnerability may be present in all releases of this version. The lack of authentication requirement significantly lowers the barrier to exploitation, making it accessible to any attacker with network access to the vulnerable endpoint. Although no known exploits are currently reported in the wild, the nature of SQL injection vulnerabilities typically makes them attractive targets for attackers due to their potential to compromise confidentiality, integrity, and availability of data.

For European organizations using MyClub 0.5, this vulnerability poses a significant risk. The ability to execute arbitrary SQL commands without authentication can lead to severe data breaches, including exposure of personal data, intellectual property, or business-critical information. This could result in violations of the EU General Data Protection Regulation (GDPR), leading to substantial fines and reputational damage. Additionally, attackers could manipulate or delete data, disrupting business operations and causing financial losses. The vulnerability's exploitation could also serve as a foothold for further attacks within the network, such as privilege escalation or lateral movement. Organizations in sectors such as sports clubs, community organizations, or any entities relying on MyClub for member management or content publication are particularly at risk. The absence of patches or mitigations increases the urgency for organizations to implement compensating controls to protect their data and services.

Given the absence of official patches, European organizations should prioritize the following mitigations: 1) Implement Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection patterns targeting the /articles endpoint and its query parameters. 2) Employ strict input validation and sanitization on all user-supplied data, especially on the vulnerable parameters, using allowlists and parameterized queries if source code access is available. 3) Restrict network access to the MyClub application to trusted IP ranges or VPNs to reduce exposure. 4) Monitor application logs and network traffic for unusual or suspicious GET requests containing SQL keywords or anomalous parameter values. 5) Conduct regular security assessments and penetration tests focusing on injection vulnerabilities. 6) If feasible, upgrade to a newer, secure version of MyClub or replace the application with a more secure alternative. 7) Educate development and operations teams about secure coding practices and the risks of SQL injection. These measures will help reduce the risk until an official patch is released.