The CVE-2025-61118 vulnerability resides in the mCarFix Motorists App version 2.3, developed by Paniel Mwaura. The core issue is improper access control that allows attackers to bypass the verification process when registering accounts. This flaw enables adversaries to create fake accounts without proper validation. Additionally, the app uses sequential numeric IDs for users and groups, which attackers can tamper with to gain unauthorized access to other users' data and group information. Such unauthorized access can lead to significant privacy breaches, exposing sensitive user information and potentially allowing misuse of the platform's features. The vulnerability does not require prior authentication or user interaction, making it easier to exploit. Although no CVSS score has been assigned and no known exploits are reported in the wild, the technical details indicate a serious risk to confidentiality and integrity within the app's ecosystem. The lack of patch links suggests that a fix may not yet be available, increasing the urgency for mitigation. This vulnerability highlights the risks of weak access control and predictable identifier schemes in mobile applications, especially those handling sensitive user data in automotive or related service domains.

For European organizations, the impact of CVE-2025-61118 could be substantial, particularly for companies involved in automotive services, fleet management, or any business relying on the mCarFix app for customer engagement or data collection. Unauthorized account creation and data access can lead to privacy violations under GDPR, resulting in regulatory fines and legal consequences. The breach of user data confidentiality can damage customer trust and brand reputation. Misuse of the platform through fake accounts may also facilitate fraudulent activities or disrupt service operations. Since the vulnerability allows attackers to bypass verification and access data without authentication, the risk of widespread exploitation is significant if the app is widely used. The absence of known exploits currently provides a window for proactive defense, but the potential for rapid exploitation remains high once details become public or tools emerge. Organizations may also face indirect impacts if attackers leverage compromised accounts to target connected systems or partners.

To mitigate this vulnerability, developers and organizations should immediately implement strong access control mechanisms that enforce strict verification during account registration, such as multi-factor authentication or CAPTCHA to prevent automated fake account creation. The use of sequential numeric IDs should be replaced with non-predictable, randomized identifiers to prevent tampering and unauthorized data access. Regular security audits and code reviews focusing on authentication and authorization logic are essential. Organizations should monitor application logs for unusual registration patterns or access attempts indicative of exploitation. If possible, restrict API endpoints to authenticated and authorized users only. Promptly apply any patches or updates released by the app developer. For organizations integrating with the mCarFix app, consider isolating its data and limiting permissions until the vulnerability is resolved. User education about suspicious activity and reporting mechanisms can also help detect abuse early. Finally, ensure compliance with GDPR by reviewing data protection measures and breach response plans.