CVE-2025-11589 identifies a SQL injection vulnerability in CodeAstro Gym Management System version 1.0, located in the /admin/user-payment.php script. The vulnerability stems from insufficient input validation of the 'plan' parameter, which is directly incorporated into SQL queries without proper sanitization or use of prepared statements. This flaw allows remote attackers to inject arbitrary SQL code, potentially leading to unauthorized data retrieval, modification, or deletion within the backend database. The attack vector requires no user interaction and no prior authentication, increasing the attack surface significantly. The CVSS 4.0 score of 5.3 reflects a medium severity, considering the low complexity of attack and moderate impact on confidentiality, integrity, and availability. Although no active exploits have been reported in the wild, the public disclosure of exploit code raises the likelihood of exploitation attempts. The vulnerability affects only version 1.0 of the product, which is used primarily by gym and fitness centers to manage user payments and subscriptions, making financial and personal data at risk. The lack of vendor-provided patches or mitigation guidance at the time of disclosure necessitates immediate defensive measures by users. This vulnerability exemplifies the critical need for secure coding practices, especially in administrative modules handling sensitive financial data.

For European organizations using CodeAstro Gym Management System 1.0, this vulnerability poses a significant risk to the confidentiality and integrity of customer payment information and subscription data. Exploitation could lead to unauthorized access to sensitive financial records, enabling fraud or identity theft. Additionally, attackers could alter payment statuses or user plans, disrupting business operations and causing financial losses. The availability of the system could also be impacted if attackers execute destructive SQL commands, leading to service downtime. Given the remote and unauthenticated nature of the exploit, attackers can target these systems from anywhere, increasing the threat landscape. Organizations in Europe with strict data protection regulations such as GDPR face potential legal and reputational consequences if breaches occur. The medium severity rating suggests moderate but tangible risks that warrant timely remediation to avoid escalation or chained attacks leveraging this vulnerability.

European organizations should immediately audit their deployments of CodeAstro Gym Management System to identify any instances of version 1.0. In the absence of an official patch, implement the following mitigations: 1) Apply strict input validation and sanitization on the 'plan' parameter within /admin/user-payment.php to block malicious SQL payloads. 2) Refactor the code to use parameterized queries or prepared statements to prevent SQL injection. 3) Restrict access to the /admin directory by IP whitelisting or VPN to limit exposure to trusted personnel only. 4) Monitor logs for unusual SQL errors or suspicious parameter values indicative of exploitation attempts. 5) Conduct regular backups of the database to enable recovery in case of data tampering or loss. 6) Consider upgrading or migrating to a newer, secure version of the management system once available. 7) Educate administrative users on security best practices and the importance of reporting anomalies promptly. These targeted actions go beyond generic advice by focusing on the specific vulnerable component and operational context.