CVE-2025-49334 is an authorization bypass vulnerability classified under CWE-639 (Authorization Bypass Through User-Controlled Key) affecting the Eduardo Villão MyD Delivery software up to version 1.3.7. The root cause lies in incorrectly configured access control mechanisms that allow attackers to manipulate user-controlled keys to bypass authorization checks. This means an unauthenticated attacker can craft requests with specially crafted keys to access resources or data that should be restricted. The vulnerability is exploitable remotely over the network without requiring any privileges or user interaction, making it relatively easy to exploit. The CVSS 3.1 base score is 5.3, indicating a medium severity, with confidentiality impact limited to unauthorized data disclosure, but no impact on integrity or availability. No patches or fixes are currently linked, and no known exploits have been reported in the wild, suggesting the vulnerability is newly disclosed or not yet weaponized. The issue affects all versions up to 1.3.7, but the exact earliest affected version is unspecified. The vulnerability highlights the importance of robust access control validation, especially in delivery and logistics applications where sensitive customer and operational data is processed. Attackers exploiting this flaw could gain unauthorized access to delivery information or user data, potentially leading to privacy violations or targeted attacks.

For European organizations using MyD Delivery, this vulnerability could lead to unauthorized disclosure of sensitive delivery or customer data, undermining confidentiality. While it does not affect data integrity or system availability, unauthorized access could facilitate further attacks, social engineering, or data leakage incidents. Organizations in sectors relying heavily on delivery logistics, such as e-commerce, retail, and supply chain management, may face operational risks and reputational damage if customer data is exposed. Compliance with GDPR and other data protection regulations could be jeopardized due to unauthorized data access. The medium severity rating suggests moderate risk, but the ease of exploitation without authentication increases urgency for remediation. The lack of known exploits reduces immediate threat but does not eliminate future risk, especially if attackers develop exploit code. European entities should prioritize vulnerability assessment and mitigation to prevent potential data breaches and maintain trust with customers and partners.

1. Conduct a thorough code review focusing on access control logic related to user-controlled keys and authorization checks within MyD Delivery. 2. Implement strict validation and sanitization of all user-supplied keys or tokens used for access control decisions. 3. Apply the principle of least privilege by restricting access to sensitive endpoints and data only to authenticated and authorized users. 4. Monitor application logs for unusual access patterns or repeated failed authorization attempts that may indicate exploitation attempts. 5. If available, apply vendor patches or updates addressing this vulnerability promptly. 6. Employ web application firewalls (WAF) with custom rules to detect and block suspicious requests exploiting authorization bypass. 7. Conduct penetration testing and vulnerability scanning focused on authorization mechanisms to identify similar weaknesses. 8. Educate development teams on secure coding practices related to access control to prevent recurrence. 9. Limit exposure of the MyD Delivery application to trusted networks or VPNs where feasible to reduce attack surface. 10. Maintain an incident response plan to quickly address any detected exploitation attempts or data breaches.