CVE-2025-6476 is a Cross-Site Request Forgery (CSRF) vulnerability identified in SourceCodester Gym Management System version 1.0. CSRF vulnerabilities occur when an attacker tricks an authenticated user into submitting a malicious request to a web application without their consent, potentially causing unauthorized actions on behalf of the user. In this case, the vulnerability affects an unspecified function within the Gym Management System, allowing remote attackers to exploit the flaw without requiring any privileges or authentication. The CVSS 4.0 base score is 5.3 (medium severity), indicating moderate risk. The attack vector is network-based (AV:N), with low attack complexity (AC:L), no privileges required (PR:N), but user interaction is necessary (UI:P). The vulnerability does not impact confidentiality but has a low impact on integrity (VI:L) and no impact on availability or confidentiality. The exploit has been publicly disclosed, increasing the risk of exploitation, although no known exploits are currently observed in the wild. The lack of patch information suggests that no official fix has been released yet. This vulnerability could allow attackers to perform unauthorized state-changing operations on behalf of legitimate users, such as modifying user data, changing settings, or manipulating gym membership details, depending on the affected function. Since the affected function is unspecified, the exact impact varies but generally involves unauthorized actions initiated via forged requests.

For European organizations using SourceCodester Gym Management System 1.0, this vulnerability poses a risk of unauthorized actions being performed on their gym management platforms. Potential impacts include manipulation of user accounts, unauthorized changes to membership or billing information, and disruption of normal business operations. While the vulnerability does not directly compromise confidentiality or availability, integrity is at risk, which could lead to data inconsistencies, financial discrepancies, or reputational damage if customer data is altered improperly. Given the public disclosure and ease of remote exploitation without authentication, attackers could target multiple organizations, especially smaller gyms or fitness centers that may lack robust security controls. The medium severity rating suggests that while the threat is not critical, it should be addressed promptly to prevent exploitation. European organizations relying on this software for member management, billing, or scheduling could face operational disruptions or customer trust issues if exploited.

1. Implement Anti-CSRF Tokens: Developers and administrators should ensure that all state-changing requests require a valid anti-CSRF token that is unique per user session and verified server-side. 2. Enforce SameSite Cookies: Configure session cookies with the 'SameSite' attribute set to 'Strict' or 'Lax' to reduce the risk of CSRF attacks via cross-origin requests. 3. Require User Interaction Confirmation: For sensitive operations, require explicit user confirmation (e.g., re-authentication or CAPTCHA) to mitigate automated CSRF attempts. 4. Update or Patch: Monitor SourceCodester’s official channels for patches or updates addressing this vulnerability and apply them promptly. 5. Web Application Firewall (WAF): Deploy WAF rules to detect and block suspicious CSRF attack patterns targeting the gym management system. 6. User Awareness: Educate users and administrators about the risks of CSRF and encourage cautious behavior regarding unsolicited links or emails. 7. Restrict Access: Limit access to the gym management system to trusted networks or VPNs where feasible to reduce exposure. 8. Audit Logs: Enable detailed logging of user actions to detect unusual or unauthorized activities that may indicate exploitation attempts.