CVE-2025-11589 identifies a SQL injection vulnerability in CodeAstro Gym Management System version 1.0, specifically within the /admin/user-payment.php script. The vulnerability arises from improper sanitization of the 'plan' parameter, which is used in SQL queries without adequate validation or parameterization. This allows remote attackers to craft malicious input that alters the intended SQL command, potentially extracting sensitive data, modifying records, or executing administrative database commands. The attack vector requires no authentication or user interaction, increasing its risk profile. The CVSS 4.0 score of 5.3 reflects a medium severity, considering the attack complexity is low but privileges required are limited (PR:L). The vulnerability does not affect system confidentiality, integrity, or availability to a critical extent but still poses a significant threat to data security. Although no active exploitation has been reported, the public availability of exploit code raises the likelihood of future attacks. The absence of official patches necessitates immediate mitigation through code fixes, input validation, and deployment of protective controls such as web application firewalls. This vulnerability highlights the importance of secure coding practices in web applications managing sensitive user and payment data.

For European organizations, particularly those operating gyms or fitness centers using CodeAstro Gym Management System 1.0, this vulnerability could lead to unauthorized access to customer payment information, membership details, and other sensitive data stored in the database. Exploitation could result in data breaches, financial fraud, reputational damage, and regulatory non-compliance under GDPR. The integrity of payment records could be compromised, leading to billing errors or fraudulent transactions. Availability impacts are less likely but possible if attackers execute destructive SQL commands. The medium severity indicates a moderate risk, but the ease of remote exploitation without authentication increases urgency. Organizations may face legal and financial consequences if personal data is exposed. Additionally, attackers could leverage this vulnerability as a foothold for further network intrusion. The threat is particularly relevant for SMEs in the fitness sector that may lack robust cybersecurity defenses.

1. Immediately audit and sanitize all inputs to the 'plan' parameter in /admin/user-payment.php, implementing parameterized queries or prepared statements to prevent SQL injection. 2. Conduct a comprehensive code review of the entire application to identify and remediate similar injection flaws. 3. Deploy a web application firewall (WAF) configured to detect and block SQL injection attempts targeting the vulnerable endpoint. 4. Monitor database logs and application logs for suspicious query patterns or anomalies indicative of exploitation attempts. 5. Restrict database user privileges to the minimum necessary to limit the impact of any successful injection. 6. If possible, isolate the gym management system network segment to reduce lateral movement risk. 7. Educate IT staff and administrators about this vulnerability and the importance of timely patching and secure coding. 8. Engage with the vendor or development team to obtain or develop an official patch or updated version. 9. Implement regular vulnerability scanning and penetration testing focused on injection flaws. 10. Ensure backups of critical data are current and tested for restoration to mitigate potential data loss.